<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:5299c9e3-e050-4927-a80b-96f4545627c8,g:be627559-089e-4d5e-a03f-f352259986b0-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://growgeneration.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="grwg-20251231.xsd#CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_a32f7ce4-b52a-4c50-b1aa-a77ebc587d61" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_56ff7f62-fce9-4588-8ab1-c948c66f2d53" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_a32f7ce4-b52a-4c50-b1aa-a77ebc587d61" xlink:to="loc_us-gaap_StatementTable_56ff7f62-fce9-4588-8ab1-c948c66f2d53" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_dd61ffa0-af10-49e4-97c6-7c720e4b58a0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_56ff7f62-fce9-4588-8ab1-c948c66f2d53" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_dd61ffa0-af10-49e4-97c6-7c720e4b58a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_dd61ffa0-af10-49e4-97c6-7c720e4b58a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_dd61ffa0-af10-49e4-97c6-7c720e4b58a0" xlink:to="loc_us-gaap_EquityComponentDomain_dd61ffa0-af10-49e4-97c6-7c720e4b58a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_b5760e52-3de0-49f9-83b9-322eee19d82f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_dd61ffa0-af10-49e4-97c6-7c720e4b58a0" xlink:to="loc_us-gaap_EquityComponentDomain_b5760e52-3de0-49f9-83b9-322eee19d82f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_3a209f86-1e1c-4a62-8831-8e532e265521" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_b5760e52-3de0-49f9-83b9-322eee19d82f" xlink:to="loc_us-gaap_CommonStockMember_3a209f86-1e1c-4a62-8831-8e532e265521" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_908110ca-47e4-43a8-81f6-135d3324313e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_b5760e52-3de0-49f9-83b9-322eee19d82f" xlink:to="loc_us-gaap_TreasuryStockCommonMember_908110ca-47e4-43a8-81f6-135d3324313e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_c6f5d8a5-e693-4b4e-914a-eda2a506837a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_b5760e52-3de0-49f9-83b9-322eee19d82f" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_c6f5d8a5-e693-4b4e-914a-eda2a506837a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_602266f4-8859-4926-829c-3d08aa830cc0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_b5760e52-3de0-49f9-83b9-322eee19d82f" xlink:to="loc_us-gaap_RetainedEarningsMember_602266f4-8859-4926-829c-3d08aa830cc0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_a32f7ce4-b52a-4c50-b1aa-a77ebc587d61" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_1bac2cac-a4ee-460d-8496-bc814e3bf8ff" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_1bac2cac-a4ee-460d-8496-bc814e3bf8ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_1fc38c3f-250e-4ae0-922b-d503707e49e9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_StockholdersEquity_1fc38c3f-250e-4ae0-922b-d503707e49e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_7328758c-387b-43f1-b0e8-fe60fcccf968" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_TreasuryStockCommonShares_7328758c-387b-43f1-b0e8-fe60fcccf968" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_cbaf5829-9e82-4e8f-9a1e-a2b9e3a81e58" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_cbaf5829-9e82-4e8f-9a1e-a2b9e3a81e58" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_d54b110c-8e48-4c99-a85e-53f5e3692f29" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_d54b110c-8e48-4c99-a85e-53f5e3692f29" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_b4b911c8-b973-4ad0-ba78-7b6045d0ae0b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_b4b911c8-b973-4ad0-ba78-7b6045d0ae0b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_3fd07eea-59ed-47e3-af55-38676fecf923" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_3fd07eea-59ed-47e3-af55-38676fecf923" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_NoncashRepurchaseOfLiabilityAwards_019cd45b-efdd-7f36-a466-24ec4a40a72d" xlink:href="grwg-20251231.xsd#grwg_NoncashRepurchaseOfLiabilityAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_grwg_NoncashRepurchaseOfLiabilityAwards_019cd45b-efdd-7f36-a466-24ec4a40a72d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_e13c3b65-73c0-47db-bfda-fbcccf2d432a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_e13c3b65-73c0-47db-bfda-fbcccf2d432a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_0834bc6b-69b8-4ddf-bc28-9c7059e42aad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_0834bc6b-69b8-4ddf-bc28-9c7059e42aad" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_StockIssuedDuringPeriodSharesCancellationOfCommonStock_5613436c-ea6a-40e9-90a3-ae5424843f2f" xlink:href="grwg-20251231.xsd#grwg_StockIssuedDuringPeriodSharesCancellationOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_grwg_StockIssuedDuringPeriodSharesCancellationOfCommonStock_5613436c-ea6a-40e9-90a3-ae5424843f2f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_StockIssuedDuringPeriodValueCancellationOfCommonStock_073d8c18-8415-4926-9dc7-273d4ea773de" xlink:href="grwg-20251231.xsd#grwg_StockIssuedDuringPeriodValueCancellationOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_grwg_StockIssuedDuringPeriodValueCancellationOfCommonStock_073d8c18-8415-4926-9dc7-273d4ea773de" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_019bbe40-4ef5-77c1-8f47-8449b1bbe370" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_019bbe40-4ef5-77c1-8f47-8449b1bbe370" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_27c97506-9fc1-4260-a1f6-3f8d1007fe5d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_27c97506-9fc1-4260-a1f6-3f8d1007fe5d" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_LiabilityRedemptionAssociatedWithBusinessAcquisitionShares_019cd45b-28af-711b-b085-532220885f32" xlink:href="grwg-20251231.xsd#grwg_LiabilityRedemptionAssociatedWithBusinessAcquisitionShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_grwg_LiabilityRedemptionAssociatedWithBusinessAcquisitionShares_019cd45b-28af-711b-b085-532220885f32" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_BusinessAcquisitionLiabilityRedemption_019cd45b-7904-7846-b6e5-7888acd6f261" xlink:href="grwg-20251231.xsd#grwg_BusinessAcquisitionLiabilityRedemption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_grwg_BusinessAcquisitionLiabilityRedemption_019cd45b-7904-7846-b6e5-7888acd6f261" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_533fbcdb-e285-4e45-a4df-f3c47a834167" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_db5da508-1fec-4f83-b1aa-9c20b0470b5d" xlink:to="loc_us-gaap_NetIncomeLoss_533fbcdb-e285-4e45-a4df-f3c47a834167" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_7eef220c-6d10-46d9-9ad2-83d6653d91b0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_263b373f-a9f4-4fec-851c-3840de5b0f60" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_d0232889-dff3-47a5-90ec-fab892e59153" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:href="grwg-20251231.xsd#grwg_AccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_AccountingPoliciesTable_c6cf9404-4bf4-4533-b784-b6d898b203d6" xlink:href="grwg-20251231.xsd#grwg_AccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_grwg_AccountingPoliciesTable_c6cf9404-4bf4-4533-b784-b6d898b203d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e3222c98-13dd-4d76-b2a2-7e645b07ec31" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_grwg_AccountingPoliciesTable_c6cf9404-4bf4-4533-b784-b6d898b203d6" xlink:to="loc_srt_RangeAxis_e3222c98-13dd-4d76-b2a2-7e645b07ec31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e3222c98-13dd-4d76-b2a2-7e645b07ec31_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e3222c98-13dd-4d76-b2a2-7e645b07ec31" xlink:to="loc_srt_RangeMember_e3222c98-13dd-4d76-b2a2-7e645b07ec31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_53f0dff5-67ec-473c-b72b-aa55f5c4e797" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e3222c98-13dd-4d76-b2a2-7e645b07ec31" xlink:to="loc_srt_RangeMember_53f0dff5-67ec-473c-b72b-aa55f5c4e797" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_5db026b0-4ace-4b0b-ad31-30d95774efc5" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_53f0dff5-67ec-473c-b72b-aa55f5c4e797" xlink:to="loc_srt_MaximumMember_5db026b0-4ace-4b0b-ad31-30d95774efc5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_bf89a178-6eeb-4b33-a11f-aaea8caed010" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_53f0dff5-67ec-473c-b72b-aa55f5c4e797" xlink:to="loc_srt_MinimumMember_bf89a178-6eeb-4b33-a11f-aaea8caed010" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_62dc1577-5293-479d-9233-3f677d5cc024" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_grwg_AccountingPoliciesTable_c6cf9404-4bf4-4533-b784-b6d898b203d6" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_62dc1577-5293-479d-9233-3f677d5cc024" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_62dc1577-5293-479d-9233-3f677d5cc024_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_62dc1577-5293-479d-9233-3f677d5cc024" xlink:to="loc_us-gaap_ReceivableTypeDomain_62dc1577-5293-479d-9233-3f677d5cc024_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_a638144f-b8f7-442e-a924-2f1259736883" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_62dc1577-5293-479d-9233-3f677d5cc024" xlink:to="loc_us-gaap_ReceivableTypeDomain_a638144f-b8f7-442e-a924-2f1259736883" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableMember_8ae01da9-33b7-406d-8933-53e998c83792" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NotesReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_a638144f-b8f7-442e-a924-2f1259736883" xlink:to="loc_us-gaap_NotesReceivableMember_8ae01da9-33b7-406d-8933-53e998c83792" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_182807d2-2d35-43c9-b460-8f85359eb293" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_grwg_AccountingPoliciesTable_c6cf9404-4bf4-4533-b784-b6d898b203d6" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_182807d2-2d35-43c9-b460-8f85359eb293" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_182807d2-2d35-43c9-b460-8f85359eb293_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_182807d2-2d35-43c9-b460-8f85359eb293" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_182807d2-2d35-43c9-b460-8f85359eb293_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_748a7a59-529b-44a2-8501-d68268f16c56" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_182807d2-2d35-43c9-b460-8f85359eb293" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_748a7a59-529b-44a2-8501-d68268f16c56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_6f37ab42-ce9c-4d80-a5a9-497e46c31712" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherNonoperatingIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_748a7a59-529b-44a2-8501-d68268f16c56" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_6f37ab42-ce9c-4d80-a5a9-497e46c31712" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_1f4587ac-b5d7-4a50-8e03-e6930bb599d7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_grwg_AccountingPoliciesTable_c6cf9404-4bf4-4533-b784-b6d898b203d6" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_1f4587ac-b5d7-4a50-8e03-e6930bb599d7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1f4587ac-b5d7-4a50-8e03-e6930bb599d7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1f4587ac-b5d7-4a50-8e03-e6930bb599d7" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1f4587ac-b5d7-4a50-8e03-e6930bb599d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_daf6a11d-9b7b-42cb-9e27-89da843391c4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1f4587ac-b5d7-4a50-8e03-e6930bb599d7" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_daf6a11d-9b7b-42cb-9e27-89da843391c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashMember_53d3e092-0c97-4ced-a0e8-1412852cacf1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_daf6a11d-9b7b-42cb-9e27-89da843391c4" xlink:to="loc_us-gaap_CashMember_53d3e092-0c97-4ced-a0e8-1412852cacf1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFDICInsuredAmount_caa19e44-3823-4228-b449-0a1b57ee4687" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashFDICInsuredAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_us-gaap_CashFDICInsuredAmount_caa19e44-3823-4228-b449-0a1b57ee4687" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_CashSIPCInsuredAmount_44d61e8c-c356-40ff-8d5d-00a36403e691" xlink:href="grwg-20251231.xsd#grwg_CashSIPCInsuredAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_grwg_CashSIPCInsuredAmount_44d61e8c-c356-40ff-8d5d-00a36403e691" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashUninsuredAmount_247ced16-a381-4077-9931-076a225f2158" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashUninsuredAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_us-gaap_CashUninsuredAmount_247ced16-a381-4077-9931-076a225f2158" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ChangeInFairValueOfMarketableSecurities_6c1f5622-4583-490d-a9d5-b3f397a22801" xlink:href="grwg-20251231.xsd#grwg_ChangeInFairValueOfMarketableSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_grwg_ChangeInFairValueOfMarketableSecurities_6c1f5622-4583-490d-a9d5-b3f397a22801" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_InterestPercentage_96634264-46c7-4a50-a6cc-bd2ab6676674" xlink:href="grwg-20251231.xsd#grwg_InterestPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_grwg_InterestPercentage_96634264-46c7-4a50-a6cc-bd2ab6676674" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_FinancingReceivableExcludingAccruedInterestTerm_13719bba-cc33-4054-9606-f1f7fd7de51f" xlink:href="grwg-20251231.xsd#grwg_FinancingReceivableExcludingAccruedInterestTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_grwg_FinancingReceivableExcludingAccruedInterestTerm_13719bba-cc33-4054-9606-f1f7fd7de51f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryRawMaterials_f8d0f40e-18d4-46c5-be58-38c6e1688551" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryRawMaterials"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_us-gaap_InventoryRawMaterials_f8d0f40e-18d4-46c5-be58-38c6e1688551" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWriteDown_47f18c2a-2932-4fc0-9a01-3a9f0e5150da" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryWriteDown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_us-gaap_InventoryWriteDown_47f18c2a-2932-4fc0-9a01-3a9f0e5150da" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_b54582dd-679a-47dc-8e4d-a73d76fd5c8e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_b54582dd-679a-47dc-8e4d-a73d76fd5c8e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingAndAdvertisingExpense_f4ee27be-2d35-46d1-9eed-62342a1cd8ea" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MarketingAndAdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_us-gaap_MarketingAndAdvertisingExpense_f4ee27be-2d35-46d1-9eed-62342a1cd8ea" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_471cb78d-f269-4bde-9a16-199b0a8fb9cc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_AccountingPoliciesLineItems_ec36bb02-b53e-41cd-8194-f81e637505e2" xlink:to="loc_us-gaap_NumberOfOperatingSegments_471cb78d-f269-4bde-9a16-199b0a8fb9cc" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofEstimatedUsefulLivesDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofEstimatedUsefulLivesDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofEstimatedUsefulLivesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_4112be29-65c8-4e26-849d-c49675de70f1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_7c26068f-efe6-4509-85ca-d1bae2e9f8f0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_4112be29-65c8-4e26-849d-c49675de70f1" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_7c26068f-efe6-4509-85ca-d1bae2e9f8f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_20bf3a94-b857-4073-8379-bd7c212aef30" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_7c26068f-efe6-4509-85ca-d1bae2e9f8f0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_20bf3a94-b857-4073-8379-bd7c212aef30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_20bf3a94-b857-4073-8379-bd7c212aef30_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_20bf3a94-b857-4073-8379-bd7c212aef30" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_20bf3a94-b857-4073-8379-bd7c212aef30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0cf793a6-d2a3-40be-944b-c2cd72bbd1b2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_20bf3a94-b857-4073-8379-bd7c212aef30" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0cf793a6-d2a3-40be-944b-c2cd72bbd1b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VehiclesMember_22240b4f-6592-4f5b-88f9-078b44f602ed" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VehiclesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0cf793a6-d2a3-40be-944b-c2cd72bbd1b2" xlink:to="loc_us-gaap_VehiclesMember_22240b4f-6592-4f5b-88f9-078b44f602ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_f05f7b82-37b9-421c-adb8-93e54cee6d0f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0cf793a6-d2a3-40be-944b-c2cd72bbd1b2" xlink:to="loc_us-gaap_BuildingMember_f05f7b82-37b9-421c-adb8-93e54cee6d0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_aa3d18f3-b9de-49b6-bae9-0d95457a4a1b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0cf793a6-d2a3-40be-944b-c2cd72bbd1b2" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_aa3d18f3-b9de-49b6-bae9-0d95457a4a1b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_c651aa04-2d51-485b-99fd-7e6f458a28ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0cf793a6-d2a3-40be-944b-c2cd72bbd1b2" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_c651aa04-2d51-485b-99fd-7e6f458a28ca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_dc8e239c-c29d-46a7-81a5-c84d494d4674" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0cf793a6-d2a3-40be-944b-c2cd72bbd1b2" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_dc8e239c-c29d-46a7-81a5-c84d494d4674" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e19a86ee-4179-4b0e-9fc3-883c8903f9ee" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_7c26068f-efe6-4509-85ca-d1bae2e9f8f0" xlink:to="loc_srt_RangeAxis_e19a86ee-4179-4b0e-9fc3-883c8903f9ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e19a86ee-4179-4b0e-9fc3-883c8903f9ee_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e19a86ee-4179-4b0e-9fc3-883c8903f9ee" xlink:to="loc_srt_RangeMember_e19a86ee-4179-4b0e-9fc3-883c8903f9ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4f33e56f-96ad-4017-bea7-3ad761f671ca" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e19a86ee-4179-4b0e-9fc3-883c8903f9ee" xlink:to="loc_srt_RangeMember_4f33e56f-96ad-4017-bea7-3ad761f671ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_5d050b8f-2373-488e-a191-98c8517e2641" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4f33e56f-96ad-4017-bea7-3ad761f671ca" xlink:to="loc_srt_MinimumMember_5d050b8f-2373-488e-a191-98c8517e2641" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_238a2a22-e0c3-4519-b989-171932295bcc" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4f33e56f-96ad-4017-bea7-3ad761f671ca" xlink:to="loc_srt_MaximumMember_238a2a22-e0c3-4519-b989-171932295bcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_d4b67099-4d81-4f33-8636-82693270daa3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_4112be29-65c8-4e26-849d-c49675de70f1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_d4b67099-4d81-4f33-8636-82693270daa3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofFairValueofImpairedNotesReceivableDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofFairValueofImpairedNotesReceivableDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofFairValueofImpairedNotesReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8f8cf695-4ca7-4dd6-96c5-83338eaa6354" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_e0d0795f-04b0-437f-aaef-45ab7f4acbcf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8f8cf695-4ca7-4dd6-96c5-83338eaa6354" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_e0d0795f-04b0-437f-aaef-45ab7f4acbcf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9b31cebe-cf5c-4b8a-9d93-314aa22177bd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_e0d0795f-04b0-437f-aaef-45ab7f4acbcf" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9b31cebe-cf5c-4b8a-9d93-314aa22177bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9b31cebe-cf5c-4b8a-9d93-314aa22177bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9b31cebe-cf5c-4b8a-9d93-314aa22177bd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9b31cebe-cf5c-4b8a-9d93-314aa22177bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_74b75c6a-7cd7-4926-9db8-dbe5cae83dbf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9b31cebe-cf5c-4b8a-9d93-314aa22177bd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_74b75c6a-7cd7-4926-9db8-dbe5cae83dbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_3147d6ea-0292-46ec-a718-076789922483" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_74b75c6a-7cd7-4926-9db8-dbe5cae83dbf" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_3147d6ea-0292-46ec-a718-076789922483" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_9f7be9ac-6fe4-49a2-9924-1ff42ec6a00b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_74b75c6a-7cd7-4926-9db8-dbe5cae83dbf" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_9f7be9ac-6fe4-49a2-9924-1ff42ec6a00b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_b791f35b-ff0c-47bd-a152-0bd9282c9c35" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8f8cf695-4ca7-4dd6-96c5-83338eaa6354" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_b791f35b-ff0c-47bd-a152-0bd9282c9c35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecurities_73bf5aff-d71c-4be2-8012-98df0af46ff4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MarketableSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8f8cf695-4ca7-4dd6-96c5-83338eaa6354" xlink:to="loc_us-gaap_MarketableSecurities_73bf5aff-d71c-4be2-8012-98df0af46ff4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/REVENUERECOGNITIONScheduleofCustomerTradeReceivablesandCustomerDepositLiabilityDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#REVENUERECOGNITIONScheduleofCustomerTradeReceivablesandCustomerDepositLiabilityDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/REVENUERECOGNITIONScheduleofCustomerTradeReceivablesandCustomerDepositLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_grwg_RevenueRecognitionDetailsScheduleofcustomertradereceivablesandcustomerdepositliabilityLineItems_1b2ad271-24f8-46e5-b8cc-80e21e3483fc" xlink:href="grwg-20251231.xsd#grwg_RevenueRecognitionDetailsScheduleofcustomertradereceivablesandcustomerdepositliabilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_RevenueRecognitionDetailsScheduleofcustomertradereceivablesandcustomerdepositliabilityTable_5a45f500-1716-4fd6-a377-64c4d3b2ade3" xlink:href="grwg-20251231.xsd#grwg_RevenueRecognitionDetailsScheduleofcustomertradereceivablesandcustomerdepositliabilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_grwg_RevenueRecognitionDetailsScheduleofcustomertradereceivablesandcustomerdepositliabilityLineItems_1b2ad271-24f8-46e5-b8cc-80e21e3483fc" xlink:to="loc_grwg_RevenueRecognitionDetailsScheduleofcustomertradereceivablesandcustomerdepositliabilityTable_5a45f500-1716-4fd6-a377-64c4d3b2ade3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_49393273-7449-447e-a195-1a374c2480d3" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_grwg_RevenueRecognitionDetailsScheduleofcustomertradereceivablesandcustomerdepositliabilityTable_5a45f500-1716-4fd6-a377-64c4d3b2ade3" xlink:to="loc_srt_ProductOrServiceAxis_49393273-7449-447e-a195-1a374c2480d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_49393273-7449-447e-a195-1a374c2480d3_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_49393273-7449-447e-a195-1a374c2480d3" xlink:to="loc_srt_ProductsAndServicesDomain_49393273-7449-447e-a195-1a374c2480d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_bd379d55-2f0a-4d6d-81da-296f7c45dace" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_49393273-7449-447e-a195-1a374c2480d3" xlink:to="loc_srt_ProductsAndServicesDomain_bd379d55-2f0a-4d6d-81da-296f7c45dace" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ReceivablesMember_2f5b428d-a9ea-430b-aa51-7610746974ed" xlink:href="grwg-20251231.xsd#grwg_ReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bd379d55-2f0a-4d6d-81da-296f7c45dace" xlink:to="loc_grwg_ReceivablesMember_2f5b428d-a9ea-430b-aa51-7610746974ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_CustomerDepositLiabilityMember_c43000b9-e361-4a46-8a29-ef2db82bb242" xlink:href="grwg-20251231.xsd#grwg_CustomerDepositLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bd379d55-2f0a-4d6d-81da-296f7c45dace" xlink:to="loc_grwg_CustomerDepositLiabilityMember_c43000b9-e361-4a46-8a29-ef2db82bb242" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_RevenueRecognitionCustomerDepositsRollForward_165de1c2-5f15-419b-8bd7-4a104e68f34e" xlink:href="grwg-20251231.xsd#grwg_RevenueRecognitionCustomerDepositsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_RevenueRecognitionDetailsScheduleofcustomertradereceivablesandcustomerdepositliabilityLineItems_1b2ad271-24f8-46e5-b8cc-80e21e3483fc" xlink:to="loc_grwg_RevenueRecognitionCustomerDepositsRollForward_165de1c2-5f15-419b-8bd7-4a104e68f34e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_e1824d6b-2b2b-4e56-bb3f-a6964a00df76" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_RevenueRecognitionCustomerDepositsRollForward_165de1c2-5f15-419b-8bd7-4a104e68f34e" xlink:to="loc_us-gaap_ContractWithCustomerLiability_e1824d6b-2b2b-4e56-bb3f-a6964a00df76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_02dca306-27b2-4420-a5cd-37366613a7b5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_d02bfda9-107f-4fb2-bfe0-6c95c31d47b9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grwg_RevenueRecognitionCustomerDepositsRollForward_165de1c2-5f15-419b-8bd7-4a104e68f34e" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_d02bfda9-107f-4fb2-bfe0-6c95c31d47b9" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/REVENUERECOGNITIONNarrativeDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#REVENUERECOGNITIONNarrativeDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/REVENUERECOGNITIONNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_0da61978-5519-4bbb-9e52-112c862a5209" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_aa619fa9-3f07-4582-9f2e-249ae66d11da" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0da61978-5519-4bbb-9e52-112c862a5209" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_aa619fa9-3f07-4582-9f2e-249ae66d11da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_8c4dd270-6666-4c57-8656-7eb4b87e5fc4" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_aa619fa9-3f07-4582-9f2e-249ae66d11da" xlink:to="loc_srt_RangeAxis_8c4dd270-6666-4c57-8656-7eb4b87e5fc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8c4dd270-6666-4c57-8656-7eb4b87e5fc4_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_8c4dd270-6666-4c57-8656-7eb4b87e5fc4" xlink:to="loc_srt_RangeMember_8c4dd270-6666-4c57-8656-7eb4b87e5fc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_15b85311-9b47-4209-bc27-50c011c03c3d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_8c4dd270-6666-4c57-8656-7eb4b87e5fc4" xlink:to="loc_srt_RangeMember_15b85311-9b47-4209-bc27-50c011c03c3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_2ef04d1b-ebb6-4892-b2f5-0eb0ca29061d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_15b85311-9b47-4209-bc27-50c011c03c3d" xlink:to="loc_srt_MinimumMember_2ef04d1b-ebb6-4892-b2f5-0eb0ca29061d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_0641dbed-a92e-4127-a785-d636b85cdf94" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_15b85311-9b47-4209-bc27-50c011c03c3d" xlink:to="loc_srt_MaximumMember_0641dbed-a92e-4127-a785-d636b85cdf94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_0beced82-fccb-426b-b1df-ccfffe57d069" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_aa619fa9-3f07-4582-9f2e-249ae66d11da" xlink:to="loc_srt_LitigationCaseAxis_0beced82-fccb-426b-b1df-ccfffe57d069" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_0beced82-fccb-426b-b1df-ccfffe57d069_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_0beced82-fccb-426b-b1df-ccfffe57d069" xlink:to="loc_srt_LitigationCaseTypeDomain_0beced82-fccb-426b-b1df-ccfffe57d069_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_874922d8-52ed-4f85-bae7-effb0f508b9a" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_0beced82-fccb-426b-b1df-ccfffe57d069" xlink:to="loc_srt_LitigationCaseTypeDomain_874922d8-52ed-4f85-bae7-effb0f508b9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_GrowGenerationCorpVsTGCSystemsLLCMember_77d2b70d-bcb6-4281-9c9a-889cfe1f8652" xlink:href="grwg-20251231.xsd#grwg_GrowGenerationCorpVsTGCSystemsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_874922d8-52ed-4f85-bae7-effb0f508b9a" xlink:to="loc_grwg_GrowGenerationCorpVsTGCSystemsLLCMember_77d2b70d-bcb6-4281-9c9a-889cfe1f8652" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_5a760a33-cbf6-488b-a3c3-bf5f52e4f978" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_aa619fa9-3f07-4582-9f2e-249ae66d11da" xlink:to="loc_us-gaap_LitigationStatusAxis_5a760a33-cbf6-488b-a3c3-bf5f52e4f978" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_5a760a33-cbf6-488b-a3c3-bf5f52e4f978_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_5a760a33-cbf6-488b-a3c3-bf5f52e4f978" xlink:to="loc_us-gaap_LitigationStatusDomain_5a760a33-cbf6-488b-a3c3-bf5f52e4f978_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_fa89a924-daa1-44c7-ab33-5583f0f88847" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_5a760a33-cbf6-488b-a3c3-bf5f52e4f978" xlink:to="loc_us-gaap_LitigationStatusDomain_fa89a924-daa1-44c7-ab33-5583f0f88847" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PendingLitigationMember_86389115-d02a-46a1-aa15-b9d72fd944c3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PendingLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_fa89a924-daa1-44c7-ab33-5583f0f88847" xlink:to="loc_us-gaap_PendingLitigationMember_86389115-d02a-46a1-aa15-b9d72fd944c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_8f7cc9b9-4208-40d3-87ed-2a52104ff2f1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0da61978-5519-4bbb-9e52-112c862a5209" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_8f7cc9b9-4208-40d3-87ed-2a52104ff2f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_TradeReceivableStatedInterestRate_06b12c81-e07b-405a-964b-4cc0a260246e" xlink:href="grwg-20251231.xsd#grwg_TradeReceivableStatedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0da61978-5519-4bbb-9e52-112c862a5209" xlink:to="loc_grwg_TradeReceivableStatedInterestRate_06b12c81-e07b-405a-964b-4cc0a260246e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_TradeReceivablePaymentTerm_9daef08f-46f1-4c74-b3c3-2e719f627c12" xlink:href="grwg-20251231.xsd#grwg_TradeReceivablePaymentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0da61978-5519-4bbb-9e52-112c862a5209" xlink:to="loc_grwg_TradeReceivablePaymentTerm_9daef08f-46f1-4c74-b3c3-2e719f627c12" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLegalSettlements_f9329d73-c059-4706-b078-4dfe3b3e0209" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromLegalSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0da61978-5519-4bbb-9e52-112c862a5209" xlink:to="loc_us-gaap_ProceedsFromLegalSettlements_f9329d73-c059-4706-b078-4dfe3b3e0209" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterestCurrent_37a83b28-df75-46c9-a25a-a15855f43ab7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterestCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0da61978-5519-4bbb-9e52-112c862a5209" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterestCurrent_37a83b28-df75-46c9-a25a-a15855f43ab7" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/REVENUERECOGNITIONScheduleofLongTermTradeReceivablesDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#REVENUERECOGNITIONScheduleofLongTermTradeReceivablesDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/REVENUERECOGNITIONScheduleofLongTermTradeReceivablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_ed40aab8-e494-462a-971a-5c07f18dfbed" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_1f787427-0dcf-44df-aacc-62953eb3868a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_ed40aab8-e494-462a-971a-5c07f18dfbed" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_1f787427-0dcf-44df-aacc-62953eb3868a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_df2f8eee-fef0-43fc-bc01-041c5c834d15" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_1f787427-0dcf-44df-aacc-62953eb3868a" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_df2f8eee-fef0-43fc-bc01-041c5c834d15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_df2f8eee-fef0-43fc-bc01-041c5c834d15_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_df2f8eee-fef0-43fc-bc01-041c5c834d15" xlink:to="loc_us-gaap_ReceivableTypeDomain_df2f8eee-fef0-43fc-bc01-041c5c834d15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_00fe58ff-ac0c-4fb6-be3a-f2092559673f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_df2f8eee-fef0-43fc-bc01-041c5c834d15" xlink:to="loc_us-gaap_ReceivableTypeDomain_00fe58ff-ac0c-4fb6-be3a-f2092559673f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeAccountsReceivableMember_d21eef12-6df2-44fe-8432-3a2314c2f7ea" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TradeAccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_00fe58ff-ac0c-4fb6-be3a-f2092559673f" xlink:to="loc_us-gaap_TradeAccountsReceivableMember_d21eef12-6df2-44fe-8432-3a2314c2f7ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableMember_9106a532-e4e9-40a0-a90b-9249e149fb14" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NotesReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_00fe58ff-ac0c-4fb6-be3a-f2092559673f" xlink:to="loc_us-gaap_NotesReceivableMember_9106a532-e4e9-40a0-a90b-9249e149fb14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_26ec68fd-1677-4ac2-8103-b3002d5c802f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_ed40aab8-e494-462a-971a-5c07f18dfbed" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_26ec68fd-1677-4ac2-8103-b3002d5c802f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_a531ac63-5117-4243-ab0c-caecbea9f8a9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_ed40aab8-e494-462a-971a-5c07f18dfbed" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_a531ac63-5117-4243-ab0c-caecbea9f8a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_458d2910-85da-4653-8a9e-d3cf32bc2c43" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_ed40aab8-e494-462a-971a-5c07f18dfbed" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_458d2910-85da-4653-8a9e-d3cf32bc2c43" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/PROPERTYANDEQUIPMENTScheduleofPropertyandEquipmentDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#PROPERTYANDEQUIPMENTScheduleofPropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/PROPERTYANDEQUIPMENTScheduleofPropertyandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_f05349fe-fd2b-463c-9242-c039595a6bdf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_b664a383-a028-46b0-aaf0-ab364eb20aff" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_f05349fe-fd2b-463c-9242-c039595a6bdf" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_b664a383-a028-46b0-aaf0-ab364eb20aff" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_269f33ea-3b51-4bee-93a3-99f1c061fd1d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_b664a383-a028-46b0-aaf0-ab364eb20aff" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_269f33ea-3b51-4bee-93a3-99f1c061fd1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_269f33ea-3b51-4bee-93a3-99f1c061fd1d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_269f33ea-3b51-4bee-93a3-99f1c061fd1d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_269f33ea-3b51-4bee-93a3-99f1c061fd1d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_49f583ff-96e9-4938-9ca3-37ed95d559b0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_269f33ea-3b51-4bee-93a3-99f1c061fd1d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_49f583ff-96e9-4938-9ca3-37ed95d559b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VehiclesMember_0063ff3f-11a1-4b94-910b-cb553f13d918" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VehiclesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_49f583ff-96e9-4938-9ca3-37ed95d559b0" xlink:to="loc_us-gaap_VehiclesMember_0063ff3f-11a1-4b94-910b-cb553f13d918" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAndBuildingMember_2e3f82b3-7ccf-4337-ae04-c33d98139862" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LandAndBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_49f583ff-96e9-4938-9ca3-37ed95d559b0" xlink:to="loc_us-gaap_LandAndBuildingMember_2e3f82b3-7ccf-4337-ae04-c33d98139862" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_8fed6015-69cb-45e2-9d7a-03ad76b8d246" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_49f583ff-96e9-4938-9ca3-37ed95d559b0" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_8fed6015-69cb-45e2-9d7a-03ad76b8d246" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_9d3e12d8-eaf2-45f5-8681-7297fbe284ea" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_49f583ff-96e9-4938-9ca3-37ed95d559b0" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_9d3e12d8-eaf2-45f5-8681-7297fbe284ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_CapitalizedSoftwareMember_49e29ceb-3a9f-46c2-85b0-81e7fecf656e" xlink:href="grwg-20251231.xsd#grwg_CapitalizedSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_49f583ff-96e9-4938-9ca3-37ed95d559b0" xlink:to="loc_grwg_CapitalizedSoftwareMember_49e29ceb-3a9f-46c2-85b0-81e7fecf656e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_5f81e7f2-7219-423d-8458-efb52dfad8a9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_49f583ff-96e9-4938-9ca3-37ed95d559b0" xlink:to="loc_us-gaap_ConstructionInProgressMember_5f81e7f2-7219-423d-8458-efb52dfad8a9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019c05a6-eb69-7b0f-923a-0c8a376081fc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_b664a383-a028-46b0-aaf0-ab364eb20aff" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019c05a6-eb69-7b0f-923a-0c8a376081fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019c05a6-eb69-7b0f-923a-0c8a376081fc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongLivedAssetsHeldForSaleNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019c05a6-eb69-7b0f-923a-0c8a376081fc" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019c05a6-eb69-7b0f-923a-0c8a376081fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019c05a6-eb69-7393-a70a-c2de8036ca14" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongLivedAssetsHeldForSaleNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019c05a6-eb69-7b0f-923a-0c8a376081fc" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019c05a6-eb69-7393-a70a-c2de8036ca14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAndBuildingMember_019c05a7-364b-7b30-b874-4ae8a060f0e0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LandAndBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019c05a6-eb69-7393-a70a-c2de8036ca14" xlink:to="loc_us-gaap_LandAndBuildingMember_019c05a7-364b-7b30-b874-4ae8a060f0e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_560dad05-356d-41df-b1fd-cbdc628dbb52" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_f05349fe-fd2b-463c-9242-c039595a6bdf" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_560dad05-356d-41df-b1fd-cbdc628dbb52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_960057c4-555c-49c9-a649-14f4661e2887" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_f05349fe-fd2b-463c-9242-c039595a6bdf" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_960057c4-555c-49c9-a649-14f4661e2887" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_b54d87e2-d02e-4078-ad89-f90ab5169ecf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_f05349fe-fd2b-463c-9242-c039595a6bdf" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_b54d87e2-d02e-4078-ad89-f90ab5169ecf" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/PROPERTYANDEQUIPMENTNarrativeDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#PROPERTYANDEQUIPMENTNarrativeDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/PROPERTYANDEQUIPMENTNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd462-475f-72a1-a3e7-70fb6857f37d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019cd462-475f-761b-ba29-94d4989d9a46" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd462-475f-72a1-a3e7-70fb6857f37d" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019cd462-475f-761b-ba29-94d4989d9a46" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019cd462-475f-7fd0-8029-acffece55546" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019cd462-475f-761b-ba29-94d4989d9a46" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019cd462-475f-7fd0-8029-acffece55546" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019cd462-475f-7fd0-8029-acffece55546_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongLivedAssetsHeldForSaleNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019cd462-475f-7fd0-8029-acffece55546" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019cd462-475f-7fd0-8029-acffece55546_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019cd462-475f-743f-a198-4c163eb11687" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongLivedAssetsHeldForSaleNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_019cd462-475f-7fd0-8029-acffece55546" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019cd462-475f-743f-a198-4c163eb11687" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAndBuildingMember_019cd462-475f-7a91-940a-f32e14fc1193" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LandAndBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_019cd462-475f-743f-a198-4c163eb11687" xlink:to="loc_us-gaap_LandAndBuildingMember_019cd462-475f-7a91-940a-f32e14fc1193" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019cd462-475f-70ea-8e76-989b7b93d56c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019cd462-475f-761b-ba29-94d4989d9a46" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019cd462-475f-70ea-8e76-989b7b93d56c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019cd462-475f-70ea-8e76-989b7b93d56c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019cd462-475f-70ea-8e76-989b7b93d56c" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019cd462-475f-70ea-8e76-989b7b93d56c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019cd462-475f-7001-8920-9dd41d0ae454" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019cd462-475f-70ea-8e76-989b7b93d56c" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019cd462-475f-7001-8920-9dd41d0ae454" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019cd462-475f-7b70-a6ba-d60ae4728124" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019cd462-475f-7001-8920-9dd41d0ae454" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019cd462-475f-7b70-a6ba-d60ae4728124" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_8f791315-a92b-48fa-b7cc-a68cbc1ef5a9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd462-475f-72a1-a3e7-70fb6857f37d" xlink:to="loc_us-gaap_Depreciation_8f791315-a92b-48fa-b7cc-a68cbc1ef5a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveAcceleratedDepreciation_676ede20-6613-4a6c-b2aa-990ef823d1f1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserveAcceleratedDepreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd462-475f-72a1-a3e7-70fb6857f37d" xlink:to="loc_us-gaap_RestructuringReserveAcceleratedDepreciation_676ede20-6613-4a6c-b2aa-990ef823d1f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf_019c016a-f0e0-7b43-a26f-2fc2456db98f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd462-475f-72a1-a3e7-70fb6857f37d" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf_019c016a-f0e0-7b43-a26f-2fc2456db98f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment_019cd461-6b79-7e3c-ab7f-f2d45945670a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd462-475f-72a1-a3e7-70fb6857f37d" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment_019cd461-6b79-7e3c-ab7f-f2d45945670a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofGoodwillandImpairmentDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#GOODWILLANDINTANGIBLEASSETSScheduleofGoodwillandImpairmentDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofGoodwillandImpairmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_f7ca1834-6a65-4371-9e6a-a351495e08a6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_93b35b09-b399-40b4-b9ac-64dfc0c1d217" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f7ca1834-6a65-4371-9e6a-a351495e08a6" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_93b35b09-b399-40b4-b9ac-64dfc0c1d217" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_21f0e533-6e2a-42d4-aac0-d06491d5376e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_93b35b09-b399-40b4-b9ac-64dfc0c1d217" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_21f0e533-6e2a-42d4-aac0-d06491d5376e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_21f0e533-6e2a-42d4-aac0-d06491d5376e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_21f0e533-6e2a-42d4-aac0-d06491d5376e" xlink:to="loc_us-gaap_SegmentDomain_21f0e533-6e2a-42d4-aac0-d06491d5376e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_85f8d570-a475-415d-ae86-6d6a9e3148aa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_21f0e533-6e2a-42d4-aac0-d06491d5376e" xlink:to="loc_us-gaap_SegmentDomain_85f8d570-a475-415d-ae86-6d6a9e3148aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_CultivationAndGardeningMember_be11fd61-ff52-444a-89d4-a8ca101d6544" xlink:href="grwg-20251231.xsd#grwg_CultivationAndGardeningMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_85f8d570-a475-415d-ae86-6d6a9e3148aa" xlink:to="loc_grwg_CultivationAndGardeningMember_be11fd61-ff52-444a-89d4-a8ca101d6544" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_StorageSolutionsMember_1bd49122-6c26-4b4b-870e-e6b42de5bc11" xlink:href="grwg-20251231.xsd#grwg_StorageSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_85f8d570-a475-415d-ae86-6d6a9e3148aa" xlink:to="loc_grwg_StorageSolutionsMember_1bd49122-6c26-4b4b-870e-e6b42de5bc11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_45dcdefb-c335-4309-84c9-500e2c83aa95" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f7ca1834-6a65-4371-9e6a-a351495e08a6" xlink:to="loc_us-gaap_GoodwillRollForward_45dcdefb-c335-4309-84c9-500e2c83aa95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillGross_54d513eb-1d52-4500-bfa0-abb716f90931" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_45dcdefb-c335-4309-84c9-500e2c83aa95" xlink:to="loc_us-gaap_GoodwillGross_54d513eb-1d52-4500-bfa0-abb716f90931" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_c388f8dd-8477-4bd1-9179-10aaf5a860bd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_45dcdefb-c335-4309-84c9-500e2c83aa95" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_c388f8dd-8477-4bd1-9179-10aaf5a860bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019bc39d-2beb-7c90-b90a-b947ecd0e6e7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_45dcdefb-c335-4309-84c9-500e2c83aa95" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019bc39d-2beb-7c90-b90a-b947ecd0e6e7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillGross_017e3fac-b7e9-456b-8085-e280214df524" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillGross"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetsandImpairmentDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetsandImpairmentDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetsandImpairmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_adc461ca-5c40-4d08-96a8-c659f034ea90" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_146053b8-793b-428c-a0a6-51c463bc8ee0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_adc461ca-5c40-4d08-96a8-c659f034ea90" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_146053b8-793b-428c-a0a6-51c463bc8ee0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_0e43d35c-154c-46c0-9c11-f2aa7213d005" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_146053b8-793b-428c-a0a6-51c463bc8ee0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_0e43d35c-154c-46c0-9c11-f2aa7213d005" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_0e43d35c-154c-46c0-9c11-f2aa7213d005_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0e43d35c-154c-46c0-9c11-f2aa7213d005" xlink:to="loc_us-gaap_SegmentDomain_0e43d35c-154c-46c0-9c11-f2aa7213d005_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6245fd80-db0b-49de-b4d6-2fb455a00f8b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0e43d35c-154c-46c0-9c11-f2aa7213d005" xlink:to="loc_us-gaap_SegmentDomain_6245fd80-db0b-49de-b4d6-2fb455a00f8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_CultivationAndGardeningMember_8c2b8a98-267d-4e01-b30a-673c454e654e" xlink:href="grwg-20251231.xsd#grwg_CultivationAndGardeningMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_6245fd80-db0b-49de-b4d6-2fb455a00f8b" xlink:to="loc_grwg_CultivationAndGardeningMember_8c2b8a98-267d-4e01-b30a-673c454e654e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_StorageSolutionsMember_0fae2f95-7c62-429d-b2a6-5a3d24d1fcf6" xlink:href="grwg-20251231.xsd#grwg_StorageSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_6245fd80-db0b-49de-b4d6-2fb455a00f8b" xlink:to="loc_grwg_StorageSolutionsMember_0fae2f95-7c62-429d-b2a6-5a3d24d1fcf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_d7951736-4c55-4eb7-a721-f44d17887e6c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_adc461ca-5c40-4d08-96a8-c659f034ea90" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_d7951736-4c55-4eb7-a721-f44d17887e6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_093e196c-8a9a-4d63-b30e-1ed93a8dbda7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_d7951736-4c55-4eb7-a721-f44d17887e6c" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_093e196c-8a9a-4d63-b30e-1ed93a8dbda7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_dcf67b26-af51-4526-a225-a0e09a9ad6ba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_d7951736-4c55-4eb7-a721-f44d17887e6c" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_dcf67b26-af51-4526-a225-a0e09a9ad6ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsPurchaseAccountingAdjustments_1ac5b782-d9a2-4c3e-b235-afe804bffcfc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_d7951736-4c55-4eb7-a721-f44d17887e6c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsPurchaseAccountingAdjustments_1ac5b782-d9a2-4c3e-b235-afe804bffcfc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_9e08829e-1447-436e-bdac-1b0ee4493fec" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_d7951736-4c55-4eb7-a721-f44d17887e6c" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_9e08829e-1447-436e-bdac-1b0ee4493fec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_ecce6d7b-58d1-4118-93c5-848732f10f16" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetsDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d7c88a76-c202-4f1f-bd98-3656bd8a3114" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_d428c9f1-5cf3-4d2e-a621-3bc3961f4350" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d7c88a76-c202-4f1f-bd98-3656bd8a3114" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_d428c9f1-5cf3-4d2e-a621-3bc3961f4350" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_e2d2b5ae-6143-43a6-9c87-e082f15940a7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_d428c9f1-5cf3-4d2e-a621-3bc3961f4350" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_e2d2b5ae-6143-43a6-9c87-e082f15940a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e2d2b5ae-6143-43a6-9c87-e082f15940a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_e2d2b5ae-6143-43a6-9c87-e082f15940a7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e2d2b5ae-6143-43a6-9c87-e082f15940a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0f0e82a2-f510-4756-92ef-df7177071d3e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_e2d2b5ae-6143-43a6-9c87-e082f15940a7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0f0e82a2-f510-4756-92ef-df7177071d3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_8992d03b-0cdc-4dff-aefd-7fedfe1b1fb3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0f0e82a2-f510-4756-92ef-df7177071d3e" xlink:to="loc_us-gaap_TradeNamesMember_8992d03b-0cdc-4dff-aefd-7fedfe1b1fb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_17d9c3ca-1842-4e48-acaa-b768bc9be1ef" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0f0e82a2-f510-4756-92ef-df7177071d3e" xlink:to="loc_us-gaap_PatentsMember_17d9c3ca-1842-4e48-acaa-b768bc9be1ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_b7a2fc0e-8c2d-442a-901a-baebd14014e1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0f0e82a2-f510-4756-92ef-df7177071d3e" xlink:to="loc_us-gaap_CustomerRelationshipsMember_b7a2fc0e-8c2d-442a-901a-baebd14014e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_NonCompetesMember_b8c754ef-b710-4722-a405-e1eb8cd154d8" xlink:href="grwg-20251231.xsd#grwg_NonCompetesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0f0e82a2-f510-4756-92ef-df7177071d3e" xlink:to="loc_grwg_NonCompetesMember_b8c754ef-b710-4722-a405-e1eb8cd154d8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntellectualPropertyMember_93ccb94d-ed61-48ca-99aa-983af57e5fac" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntellectualPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0f0e82a2-f510-4756-92ef-df7177071d3e" xlink:to="loc_us-gaap_IntellectualPropertyMember_93ccb94d-ed61-48ca-99aa-983af57e5fac" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_d71dd252-78f9-463e-9124-ba067c01a0d6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d7c88a76-c202-4f1f-bd98-3656bd8a3114" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_d71dd252-78f9-463e-9124-ba067c01a0d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9547852c-8541-4217-bdb2-883c98921f66" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d7c88a76-c202-4f1f-bd98-3656bd8a3114" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9547852c-8541-4217-bdb2-883c98921f66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_96d9cd03-a03a-47c8-8ee3-eaacd209ac13" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d7c88a76-c202-4f1f-bd98-3656bd8a3114" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_96d9cd03-a03a-47c8-8ee3-eaacd209ac13" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/SHAREBASEDPAYMENTSNarrativeDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#SHAREBASEDPAYMENTSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/SHAREBASEDPAYMENTSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_62a35edb-b359-43ec-a236-65ebb440f042" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_62a35edb-b359-43ec-a236-65ebb440f042" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_461f6d89-5917-4fe4-8b26-7aefff7d7979" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_62a35edb-b359-43ec-a236-65ebb440f042" xlink:to="loc_us-gaap_PlanNameAxis_461f6d89-5917-4fe4-8b26-7aefff7d7979" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_461f6d89-5917-4fe4-8b26-7aefff7d7979_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_461f6d89-5917-4fe4-8b26-7aefff7d7979" xlink:to="loc_us-gaap_PlanNameDomain_461f6d89-5917-4fe4-8b26-7aefff7d7979_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_d0dd9cff-0810-40f5-9218-07b2391acee3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_461f6d89-5917-4fe4-8b26-7aefff7d7979" xlink:to="loc_us-gaap_PlanNameDomain_d0dd9cff-0810-40f5-9218-07b2391acee3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ThousandEighteenPlanMember_13fa19f1-82cf-4905-b2ee-c303355ab5b5" xlink:href="grwg-20251231.xsd#grwg_ThousandEighteenPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_d0dd9cff-0810-40f5-9218-07b2391acee3" xlink:to="loc_grwg_ThousandEighteenPlanMember_13fa19f1-82cf-4905-b2ee-c303355ab5b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b127094e-63c0-4af7-bf91-2457665c1faa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_62a35edb-b359-43ec-a236-65ebb440f042" xlink:to="loc_us-gaap_AwardTypeAxis_b127094e-63c0-4af7-bf91-2457665c1faa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b127094e-63c0-4af7-bf91-2457665c1faa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b127094e-63c0-4af7-bf91-2457665c1faa" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b127094e-63c0-4af7-bf91-2457665c1faa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_475fc9d8-61ec-4921-a37f-957821e42976" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b127094e-63c0-4af7-bf91-2457665c1faa" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_475fc9d8-61ec-4921-a37f-957821e42976" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_4be16205-a435-40d9-8a76-ca087f7dd947" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_475fc9d8-61ec-4921-a37f-957821e42976" xlink:to="loc_us-gaap_EmployeeStockOptionMember_4be16205-a435-40d9-8a76-ca087f7dd947" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_IncentiveStockOptionMember_18e0b5c1-6c34-4ed7-abc9-a63d498e1bdf" xlink:href="grwg-20251231.xsd#grwg_IncentiveStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_475fc9d8-61ec-4921-a37f-957821e42976" xlink:to="loc_grwg_IncentiveStockOptionMember_18e0b5c1-6c34-4ed7-abc9-a63d498e1bdf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_0d126c7c-be7f-472b-a359-69d8c7a6c097" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_475fc9d8-61ec-4921-a37f-957821e42976" xlink:to="loc_us-gaap_RestrictedStockMember_0d126c7c-be7f-472b-a359-69d8c7a6c097" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019bbe48-120a-7148-832d-80f15072efdb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_475fc9d8-61ec-4921-a37f-957821e42976" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019bbe48-120a-7148-832d-80f15072efdb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019bbdb2-5412-7e42-8e43-87e3c35208d5" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_62a35edb-b359-43ec-a236-65ebb440f042" xlink:to="loc_srt_RangeAxis_019bbdb2-5412-7e42-8e43-87e3c35208d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019bbdb2-5412-7e42-8e43-87e3c35208d5_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019bbdb2-5412-7e42-8e43-87e3c35208d5" xlink:to="loc_srt_RangeMember_019bbdb2-5412-7e42-8e43-87e3c35208d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019bbdb2-5412-79cc-ae6f-579de1ef047f" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019bbdb2-5412-7e42-8e43-87e3c35208d5" xlink:to="loc_srt_RangeMember_019bbdb2-5412-79cc-ae6f-579de1ef047f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019bbdb2-5412-771c-ad2d-5d67a2a27a09" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019bbdb2-5412-79cc-ae6f-579de1ef047f" xlink:to="loc_srt_MinimumMember_019bbdb2-5412-771c-ad2d-5d67a2a27a09" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019bbdb2-c1c1-74dd-8dd3-6f5a681be7dc" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019bbdb2-5412-79cc-ae6f-579de1ef047f" xlink:to="loc_srt_MaximumMember_019bbdb2-c1c1-74dd-8dd3-6f5a681be7dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_StockIssuedOverTheTermOfThePlan_3430ba37-ace9-4975-b9a2-330e2c75fa8a" xlink:href="grwg-20251231.xsd#grwg_StockIssuedOverTheTermOfThePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_grwg_StockIssuedOverTheTermOfThePlan_3430ba37-ace9-4975-b9a2-330e2c75fa8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_TotalSharesAvailableForIssuance_3aba6021-f603-4ff7-8a44-a3e756ad6324" xlink:href="grwg-20251231.xsd#grwg_TotalSharesAvailableForIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_grwg_TotalSharesAvailableForIssuance_3aba6021-f603-4ff7-8a44-a3e756ad6324" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_10100515-e9c9-463f-a625-eece76b0a849" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_10100515-e9c9-463f-a625-eece76b0a849" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_c703db7c-4797-4c7a-bb95-eb201ea1ccfd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_c703db7c-4797-4c7a-bb95-eb201ea1ccfd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_UnamortizedShareBasedCompensation_a6342922-f677-4bb4-a447-5051e40bcf10" xlink:href="grwg-20251231.xsd#grwg_UnamortizedShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_grwg_UnamortizedShareBasedCompensation_a6342922-f677-4bb4-a447-5051e40bcf10" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ShareBasedCompensationWeightedAveragePeriod_c0b6dc9e-0be1-4ca3-b870-2c680252dbe5" xlink:href="grwg-20251231.xsd#grwg_ShareBasedCompensationWeightedAveragePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_grwg_ShareBasedCompensationWeightedAveragePeriod_c0b6dc9e-0be1-4ca3-b870-2c680252dbe5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019bbe48-120a-73cc-82f6-8c8a118597f4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019bbe48-120a-73cc-82f6-8c8a118597f4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_952a6a1d-a0b8-446d-b034-f2b790538e28" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_952a6a1d-a0b8-446d-b034-f2b790538e28" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019bbda1-b2bf-785d-a236-00f3edfd612b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019bbda1-b2bf-785d-a236-00f3edfd612b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019bbda2-f7a8-7e75-a5b3-5526ae70d31b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019bbda2-f7a8-7e75-a5b3-5526ae70d31b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019bbda6-f990-79eb-b24a-8cd7c8be3ae8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_285d81fd-9fe5-4143-80d1-dd0031a07ef5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019bbda6-f990-79eb-b24a-8cd7c8be3ae8" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/SHAREBASEDPAYMENTSScheduleofRestrictedStockActivityDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#SHAREBASEDPAYMENTSScheduleofRestrictedStockActivityDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/SHAREBASEDPAYMENTSScheduleofRestrictedStockActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4fdeec5d-0c57-4b82-8b18-e1bb92b16e75" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_fa535fed-04c6-4ce0-941b-dac83191b18f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4fdeec5d-0c57-4b82-8b18-e1bb92b16e75" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_fa535fed-04c6-4ce0-941b-dac83191b18f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_5d71134c-b8e2-408a-9a1f-54586c82d27a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_fa535fed-04c6-4ce0-941b-dac83191b18f" xlink:to="loc_us-gaap_AwardTypeAxis_5d71134c-b8e2-408a-9a1f-54586c82d27a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5d71134c-b8e2-408a-9a1f-54586c82d27a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_5d71134c-b8e2-408a-9a1f-54586c82d27a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5d71134c-b8e2-408a-9a1f-54586c82d27a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e6c8038a-3883-45d6-8eb9-ab92d25b2cbd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_5d71134c-b8e2-408a-9a1f-54586c82d27a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e6c8038a-3883-45d6-8eb9-ab92d25b2cbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_d805a697-b1db-4fba-93c9-427fce6be50d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e6c8038a-3883-45d6-8eb9-ab92d25b2cbd" xlink:to="loc_us-gaap_RestrictedStockMember_d805a697-b1db-4fba-93c9-427fce6be50d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_65fec481-4aa9-4054-bdd5-9592f88f2093" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4fdeec5d-0c57-4b82-8b18-e1bb92b16e75" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_65fec481-4aa9-4054-bdd5-9592f88f2093" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_3b9d7523-4278-4f64-9e1e-94f3ce032334" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_65fec481-4aa9-4054-bdd5-9592f88f2093" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_3b9d7523-4278-4f64-9e1e-94f3ce032334" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_1d40c25a-0066-4c9e-8964-81bb5750931a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_65fec481-4aa9-4054-bdd5-9592f88f2093" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_1d40c25a-0066-4c9e-8964-81bb5750931a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_a244abd0-6d2b-4c18-9138-a43d84320de7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_65fec481-4aa9-4054-bdd5-9592f88f2093" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_a244abd0-6d2b-4c18-9138-a43d84320de7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_bc99ee44-5e17-43aa-a0de-38f551e8d35c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_65fec481-4aa9-4054-bdd5-9592f88f2093" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_bc99ee44-5e17-43aa-a0de-38f551e8d35c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_0d1d3e10-06c5-4995-a7e5-b0b84a52d67f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4e7aebb8-a2e3-42af-b7ee-54c840940ab9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4fdeec5d-0c57-4b82-8b18-e1bb92b16e75" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4e7aebb8-a2e3-42af-b7ee-54c840940ab9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_0766af32-b5de-4f29-93d2-6aa020e23c08" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4e7aebb8-a2e3-42af-b7ee-54c840940ab9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_0766af32-b5de-4f29-93d2-6aa020e23c08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_708a2b7b-a304-499f-b896-ee4ad804c580" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4e7aebb8-a2e3-42af-b7ee-54c840940ab9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_708a2b7b-a304-499f-b896-ee4ad804c580" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_16b9e8ce-4f09-4b8b-a51c-9116b8695f6b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4e7aebb8-a2e3-42af-b7ee-54c840940ab9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_16b9e8ce-4f09-4b8b-a51c-9116b8695f6b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_261f5737-c06e-4abc-abd8-7939b7f5abe1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4e7aebb8-a2e3-42af-b7ee-54c840940ab9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_261f5737-c06e-4abc-abd8-7939b7f5abe1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2db79b14-df6b-4c8e-8689-59413824f95b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/EARNINGSLOSSPERSHARENarrativeDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#EARNINGSLOSSPERSHARENarrativeDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/EARNINGSLOSSPERSHARENarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_3dbf62b1-b2e6-48bc-8993-2e8dcd123290" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9ba57229-5c21-431b-972f-b6a6c7b5aadc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_3dbf62b1-b2e6-48bc-8993-2e8dcd123290" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9ba57229-5c21-431b-972f-b6a6c7b5aadc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6e2b731a-0b3a-4ab1-b5ba-fa10723fb22f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9ba57229-5c21-431b-972f-b6a6c7b5aadc" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6e2b731a-0b3a-4ab1-b5ba-fa10723fb22f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6e2b731a-0b3a-4ab1-b5ba-fa10723fb22f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6e2b731a-0b3a-4ab1-b5ba-fa10723fb22f" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6e2b731a-0b3a-4ab1-b5ba-fa10723fb22f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_f3e7f229-864f-48a7-882e-02103d65e632" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6e2b731a-0b3a-4ab1-b5ba-fa10723fb22f" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_f3e7f229-864f-48a7-882e-02103d65e632" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_5a0221f1-3ee1-471f-a2c4-bf15f0897e6d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_f3e7f229-864f-48a7-882e-02103d65e632" xlink:to="loc_us-gaap_EmployeeStockOptionMember_5a0221f1-3ee1-471f-a2c4-bf15f0897e6d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_afddab88-a64e-48da-a81e-6386a0271a1e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_f3e7f229-864f-48a7-882e-02103d65e632" xlink:to="loc_us-gaap_RestrictedStockMember_afddab88-a64e-48da-a81e-6386a0271a1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_1a504b40-5ceb-4379-88b6-175b307c6eab" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_3dbf62b1-b2e6-48bc-8993-2e8dcd123290" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_1a504b40-5ceb-4379-88b6-175b307c6eab" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/ACQUISITIONSNarrativeDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#ACQUISITIONSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/ACQUISITIONSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_027a388e-a11c-46bf-bbbe-145b40b2b2f5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_419b8a3b-51ca-4546-9bfe-bc84d80f246b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_027a388e-a11c-46bf-bbbe-145b40b2b2f5" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_419b8a3b-51ca-4546-9bfe-bc84d80f246b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_c35320a4-6b07-466c-aac7-950e22521c26" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_419b8a3b-51ca-4546-9bfe-bc84d80f246b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_c35320a4-6b07-466c-aac7-950e22521c26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c35320a4-6b07-466c-aac7-950e22521c26_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_c35320a4-6b07-466c-aac7-950e22521c26" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c35320a4-6b07-466c-aac7-950e22521c26_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2506d73e-2d8f-4780-8a0e-406a1196654a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_c35320a4-6b07-466c-aac7-950e22521c26" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2506d73e-2d8f-4780-8a0e-406a1196654a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ViagrowMember_019bdc38-6241-78be-8003-6212dba7dbf4" xlink:href="grwg-20251231.xsd#grwg_ViagrowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2506d73e-2d8f-4780-8a0e-406a1196654a" xlink:to="loc_grwg_ViagrowMember_019bdc38-6241-78be-8003-6212dba7dbf4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_SouthsideGardenSupplyMember_019cd47b-051d-71e0-a179-52a77d3fa9f8" xlink:href="grwg-20251231.xsd#grwg_SouthsideGardenSupplyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2506d73e-2d8f-4780-8a0e-406a1196654a" xlink:to="loc_grwg_SouthsideGardenSupplyMember_019cd47b-051d-71e0-a179-52a77d3fa9f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_019cd47b-051d-78c1-b7f6-804db1852a01" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2506d73e-2d8f-4780-8a0e-406a1196654a" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_019cd47b-051d-78c1-b7f6-804db1852a01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_a24290ba-42f6-4d5c-8cca-ea008a16ffb9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_027a388e-a11c-46bf-bbbe-145b40b2b2f5" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_a24290ba-42f6-4d5c-8cca-ea008a16ffb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts_8b985041-488f-4c6d-9fd0-c58577300a9e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_027a388e-a11c-46bf-bbbe-145b40b2b2f5" xlink:to="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts_8b985041-488f-4c6d-9fd0-c58577300a9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_83b7203b-aaa6-4e6e-b0f4-8e651afc42a4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_027a388e-a11c-46bf-bbbe-145b40b2b2f5" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_83b7203b-aaa6-4e6e-b0f4-8e651afc42a4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019cd47b-051d-71e1-a0b4-2165456f7611" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_027a388e-a11c-46bf-bbbe-145b40b2b2f5" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019cd47b-051d-71e1-a0b4-2165456f7611" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndemnityHoldback_019cd47b-051d-71f8-b0dd-30ab21681953" xlink:href="grwg-20251231.xsd#grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndemnityHoldback"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_027a388e-a11c-46bf-bbbe-145b40b2b2f5" xlink:to="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndemnityHoldback_019cd47b-051d-71f8-b0dd-30ab21681953" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndemnityHoldbackRounded_019cd47b-051d-71de-9c68-d683d4b6405c" xlink:href="grwg-20251231.xsd#grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndemnityHoldbackRounded"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_027a388e-a11c-46bf-bbbe-145b40b2b2f5" xlink:to="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndemnityHoldbackRounded_019cd47b-051d-71de-9c68-d683d4b6405c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_019cd47c-5ac4-77e9-94b0-3ddb7297c284" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_027a388e-a11c-46bf-bbbe-145b40b2b2f5" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_019cd47c-5ac4-77e9-94b0-3ddb7297c284" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/ACQUISITIONSScheduleofPurchasePriceDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#ACQUISITIONSScheduleofPurchasePriceDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/ACQUISITIONSScheduleofPurchasePriceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_da3f67c9-5727-4c65-b86b-b7a1ebdeda7e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_087647a2-6d9b-41e6-9225-3fad0e3b74ab" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_da3f67c9-5727-4c65-b86b-b7a1ebdeda7e" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_087647a2-6d9b-41e6-9225-3fad0e3b74ab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_34377285-539d-4d46-b039-69fbb6bd11be" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_087647a2-6d9b-41e6-9225-3fad0e3b74ab" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_34377285-539d-4d46-b039-69fbb6bd11be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_34377285-539d-4d46-b039-69fbb6bd11be_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_34377285-539d-4d46-b039-69fbb6bd11be" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_34377285-539d-4d46-b039-69fbb6bd11be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e53dc36f-18d4-4e0b-86ef-09aaa742cc3a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_34377285-539d-4d46-b039-69fbb6bd11be" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e53dc36f-18d4-4e0b-86ef-09aaa742cc3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ViagrowMember_019bdc3c-f7bf-7741-a20e-2eb23a2d921e" xlink:href="grwg-20251231.xsd#grwg_ViagrowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e53dc36f-18d4-4e0b-86ef-09aaa742cc3a" xlink:to="loc_grwg_ViagrowMember_019bdc3c-f7bf-7741-a20e-2eb23a2d921e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_SouthsideGardenSupplyMember_f6449835-feb0-4184-94b6-4897a21db71b" xlink:href="grwg-20251231.xsd#grwg_SouthsideGardenSupplyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e53dc36f-18d4-4e0b-86ef-09aaa742cc3a" xlink:to="loc_grwg_SouthsideGardenSupplyMember_f6449835-feb0-4184-94b6-4897a21db71b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_0cfb8a86-2232-437c-96df-5a122bb5f089" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e53dc36f-18d4-4e0b-86ef-09aaa742cc3a" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_0cfb8a86-2232-437c-96df-5a122bb5f089" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019bdc3c-f7bf-7c51-8707-6f42ee17d1f9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_da3f67c9-5727-4c65-b86b-b7a1ebdeda7e" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019bdc3c-f7bf-7c51-8707-6f42ee17d1f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019bdc3c-f7bf-7736-8cf2-3e9fc118a2dc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_da3f67c9-5727-4c65-b86b-b7a1ebdeda7e" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019bdc3c-f7bf-7736-8cf2-3e9fc118a2dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019bdc3c-f7bf-76a6-9dcf-f47dc14a95f8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_da3f67c9-5727-4c65-b86b-b7a1ebdeda7e" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019bdc3c-f7bf-76a6-9dcf-f47dc14a95f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_019bdc3c-f7bf-7aab-b0c1-e0c340acf678" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_da3f67c9-5727-4c65-b86b-b7a1ebdeda7e" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_019bdc3c-f7bf-7aab-b0c1-e0c340acf678" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019bdc3c-f7bf-74e2-bc29-1613beac983f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_da3f67c9-5727-4c65-b86b-b7a1ebdeda7e" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019bdc3c-f7bf-74e2-bc29-1613beac983f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_da3f67c9-5727-4c65-b86b-b7a1ebdeda7e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_019bdc3f-5e14-75d1-8fd8-02abcdeeb648" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_019bdc3f-5e14-75d1-8fd8-02abcdeeb648" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_019bdc3f-5e14-76ee-868b-927fdf3b9b18" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_019bdc3f-5e14-76ee-868b-927fdf3b9b18" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment_019bdc3f-5e14-7276-a837-54355e1a4ccf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment_019bdc3f-5e14-7276-a837-54355e1a4ccf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightToUseAsset_019c01c8-854e-7f8f-a723-2510f7d48a7d" xlink:href="grwg-20251231.xsd#grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightToUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:to="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightToUseAsset_019c01c8-854e-7f8f-a723-2510f7d48a7d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiability_019c01c9-b8d9-7f2a-a75c-c5e1036814e3" xlink:href="grwg-20251231.xsd#grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:to="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiability_019c01c9-b8d9-7f2a-a75c-c5e1036814e3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerRelationships_019c01c9-efc8-725a-855c-8ec5608d4e7f" xlink:href="grwg-20251231.xsd#grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerRelationships"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:to="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerRelationships_019c01c9-efc8-725a-855c-8ec5608d4e7f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwill_019c01ca-34de-7d21-a869-f55b01579884" xlink:href="grwg-20251231.xsd#grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:to="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwill_019c01ca-34de-7d21-a869-f55b01579884" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019bdc3c-f7bf-7583-b031-71ced06c9d75" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019bdc3c-f7bf-7583-b031-71ced06c9d75" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019bdc3c-f7bf-79fe-a7a9-e01a16caedfa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:to="loc_us-gaap_Goodwill_019bdc3c-f7bf-79fe-a7a9-e01a16caedfa" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019bdc3c-f7bf-7d54-8fb4-ca9292aea429" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019bdc3c-f7bf-7d54-8fb4-ca9292aea429" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019bdc42-66fb-71f9-b9eb-f215b8633ec8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_019bdc41-6222-7664-8e27-debb580183e2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019bdc42-66fb-71f9-b9eb-f215b8633ec8" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019cd489-4881-7706-bca6-d127f28e41ab" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_da3f67c9-5727-4c65-b86b-b7a1ebdeda7e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019cd489-4881-7706-bca6-d127f28e41ab" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndemnityHoldback_019cd489-4881-775f-81be-df3480a09f77" xlink:href="grwg-20251231.xsd#grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndemnityHoldback"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_da3f67c9-5727-4c65-b86b-b7a1ebdeda7e" xlink:to="loc_grwg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndemnityHoldback_019cd489-4881-775f-81be-df3480a09f77" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/ACQUISITIONSScheduleofFairValueofIntangibleAssetsAcquiredDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#ACQUISITIONSScheduleofFairValueofIntangibleAssetsAcquiredDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/ACQUISITIONSScheduleofFairValueofIntangibleAssetsAcquiredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_019bdc56-7553-71e6-80b6-14efc506a7a8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_019bdc56-7553-77f0-b038-676c4ee021e8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_019bdc56-7553-71e6-80b6-14efc506a7a8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_019bdc56-7553-77f0-b038-676c4ee021e8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019bdc56-7553-7b2f-a68b-d5fa3a6e96de" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_019bdc56-7553-77f0-b038-676c4ee021e8" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019bdc56-7553-7b2f-a68b-d5fa3a6e96de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019bdc56-7553-7b2f-a68b-d5fa3a6e96de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019bdc56-7553-7b2f-a68b-d5fa3a6e96de" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019bdc56-7553-7b2f-a68b-d5fa3a6e96de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019bdc56-7553-78a1-a678-8383bc99c200" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019bdc56-7553-7b2f-a68b-d5fa3a6e96de" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019bdc56-7553-78a1-a678-8383bc99c200" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ViagrowMember_019bdc56-7553-76c0-93de-c88ef2bece86" xlink:href="grwg-20251231.xsd#grwg_ViagrowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019bdc56-7553-78a1-a678-8383bc99c200" xlink:to="loc_grwg_ViagrowMember_019bdc56-7553-76c0-93de-c88ef2bece86" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019bdc56-7553-75b8-b60b-97b4cedacd68" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_019bdc56-7553-77f0-b038-676c4ee021e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019bdc56-7553-75b8-b60b-97b4cedacd68" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019bdc56-7553-75b8-b60b-97b4cedacd68_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019bdc56-7553-75b8-b60b-97b4cedacd68" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019bdc56-7553-75b8-b60b-97b4cedacd68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019bdc56-7553-7d02-a4cd-111765aea916" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019bdc56-7553-75b8-b60b-97b4cedacd68" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019bdc56-7553-7d02-a4cd-111765aea916" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019bdc56-7553-730a-8586-b3f972969a39" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019bdc56-7553-7d02-a4cd-111765aea916" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019bdc56-7553-730a-8586-b3f972969a39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_019bdc56-7553-718c-a2c8-8d4e503916c7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_019bdc56-7553-71e6-80b6-14efc506a7a8" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_019bdc56-7553-718c-a2c8-8d4e503916c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019bdc56-7553-7581-8d18-e01cede79a04" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_019bdc56-7553-71e6-80b6-14efc506a7a8" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019bdc56-7553-7581-8d18-e01cede79a04" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/ACQUISITIONSScheduleofrevenueandearningsincludedinconsolidatedincomestatementDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#ACQUISITIONSScheduleofrevenueandearningsincludedinconsolidatedincomestatementDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/ACQUISITIONSScheduleofrevenueandearningsincludedinconsolidatedincomestatementDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_585ae97b-3e00-47c3-942f-0a0aba218f7a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_24de2ca3-0139-4afb-9fa9-e473e6bfcbba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_585ae97b-3e00-47c3-942f-0a0aba218f7a" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_24de2ca3-0139-4afb-9fa9-e473e6bfcbba" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_88d43f69-aa06-464c-a274-924559e4bc51" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_24de2ca3-0139-4afb-9fa9-e473e6bfcbba" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_88d43f69-aa06-464c-a274-924559e4bc51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_88d43f69-aa06-464c-a274-924559e4bc51_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_88d43f69-aa06-464c-a274-924559e4bc51" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_88d43f69-aa06-464c-a274-924559e4bc51_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_12bdb2a7-bd6f-4d7c-8c97-9affac8b898b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_88d43f69-aa06-464c-a274-924559e4bc51" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_12bdb2a7-bd6f-4d7c-8c97-9affac8b898b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ViagrowMember_019bdc5b-70e8-7c17-bdb9-a0984bc7d94a" xlink:href="grwg-20251231.xsd#grwg_ViagrowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_12bdb2a7-bd6f-4d7c-8c97-9affac8b898b" xlink:to="loc_grwg_ViagrowMember_019bdc5b-70e8-7c17-bdb9-a0984bc7d94a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_SouthsideGardenSupplyMember_019cd48a-e322-7547-833b-b2374a84be0b" xlink:href="grwg-20251231.xsd#grwg_SouthsideGardenSupplyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_12bdb2a7-bd6f-4d7c-8c97-9affac8b898b" xlink:to="loc_grwg_SouthsideGardenSupplyMember_019cd48a-e322-7547-833b-b2374a84be0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_019cd48a-e322-7687-a6da-4fe747708e40" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_12bdb2a7-bd6f-4d7c-8c97-9affac8b898b" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_019cd48a-e322-7687-a6da-4fe747708e40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_019cd48a-e322-7afe-912e-ae0867a7b455" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_585ae97b-3e00-47c3-942f-0a0aba218f7a" xlink:to="loc_us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_019cd48a-e322-7afe-912e-ae0867a7b455" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_019bdc5e-73b1-73aa-8828-91734b0a451c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_585ae97b-3e00-47c3-942f-0a0aba218f7a" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_019bdc5e-73b1-73aa-8828-91734b0a451c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_019bdc5e-73b1-70c4-a0f6-b1d87a1b6228" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_585ae97b-3e00-47c3-942f-0a0aba218f7a" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_019bdc5e-73b1-70c4-a0f6-b1d87a1b6228" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/ACQUISITIONSScheduleofproformaconsolidatedincomestatementDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#ACQUISITIONSScheduleofproformaconsolidatedincomestatementDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/ACQUISITIONSScheduleofproformaconsolidatedincomestatementDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_0052166b-36e1-46b6-b28f-f39237c70282" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d590d6a5-6a96-418c-b228-eb46bc00b70d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0052166b-36e1-46b6-b28f-f39237c70282" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d590d6a5-6a96-418c-b228-eb46bc00b70d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_f56427a2-1088-4533-9d35-d82d9cf90ce2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d590d6a5-6a96-418c-b228-eb46bc00b70d" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_f56427a2-1088-4533-9d35-d82d9cf90ce2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f56427a2-1088-4533-9d35-d82d9cf90ce2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f56427a2-1088-4533-9d35-d82d9cf90ce2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f56427a2-1088-4533-9d35-d82d9cf90ce2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e5a939d0-437d-4c90-bfa3-e8df9e5584c9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f56427a2-1088-4533-9d35-d82d9cf90ce2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e5a939d0-437d-4c90-bfa3-e8df9e5584c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ViagrowMember_019bdc5b-c578-78ba-8f7c-c58b610c93fc" xlink:href="grwg-20251231.xsd#grwg_ViagrowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e5a939d0-437d-4c90-bfa3-e8df9e5584c9" xlink:to="loc_grwg_ViagrowMember_019bdc5b-c578-78ba-8f7c-c58b610c93fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_SouthsideGardenSupplyMember_019c01d0-49c2-7a27-b361-48a415570749" xlink:href="grwg-20251231.xsd#grwg_SouthsideGardenSupplyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e5a939d0-437d-4c90-bfa3-e8df9e5584c9" xlink:to="loc_grwg_SouthsideGardenSupplyMember_019c01d0-49c2-7a27-b361-48a415570749" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_a294bc26-92b5-48ee-976e-79e752a22d88" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0052166b-36e1-46b6-b28f-f39237c70282" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_a294bc26-92b5-48ee-976e-79e752a22d88" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_45501f03-3c67-4e91-8f74-0f858be06292" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0052166b-36e1-46b6-b28f-f39237c70282" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_45501f03-3c67-4e91-8f74-0f858be06292" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/RELATEDPARTIESDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#RELATEDPARTIESDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/RELATEDPARTIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_5d74596a-8d41-4b57-a0cf-d05a144d630b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c37f1a0f-7994-4db6-82a7-0d8a7e5ecbc1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_5d74596a-8d41-4b57-a0cf-d05a144d630b" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c37f1a0f-7994-4db6-82a7-0d8a7e5ecbc1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_d242b62e-07b2-4d29-9a0e-1310c6f5e550" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c37f1a0f-7994-4db6-82a7-0d8a7e5ecbc1" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_d242b62e-07b2-4d29-9a0e-1310c6f5e550" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_d242b62e-07b2-4d29-9a0e-1310c6f5e550_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_d242b62e-07b2-4d29-9a0e-1310c6f5e550" xlink:to="loc_us-gaap_RelatedPartyDomain_d242b62e-07b2-4d29-9a0e-1310c6f5e550_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_ebb81674-1570-4e7d-b309-ab6f4d58132f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_d242b62e-07b2-4d29-9a0e-1310c6f5e550" xlink:to="loc_us-gaap_RelatedPartyDomain_ebb81674-1570-4e7d-b309-ab6f4d58132f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember_39d5ee8a-81a7-47f3-89c2-095beb1d9b0e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_ebb81674-1570-4e7d-b309-ab6f4d58132f" xlink:to="loc_us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember_39d5ee8a-81a7-47f3-89c2-095beb1d9b0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LegalFees_54a2764e-757c-4d33-ada6-25d609aedf1d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LegalFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_5d74596a-8d41-4b57-a0cf-d05a144d630b" xlink:to="loc_us-gaap_LegalFees_54a2764e-757c-4d33-ada6-25d609aedf1d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/SEGMENTSScheduleofDisaggregationofRevenuesDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#SEGMENTSScheduleofDisaggregationofRevenuesDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/SEGMENTSScheduleofDisaggregationofRevenuesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_189d3f46-cadc-4114-a94f-c1b705c85174" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_76b2f725-1a79-4be1-8e1e-e9e55614f1c6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_189d3f46-cadc-4114-a94f-c1b705c85174" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_76b2f725-1a79-4be1-8e1e-e9e55614f1c6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_16f19597-92ca-4983-9977-ef1831e8abf6" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_76b2f725-1a79-4be1-8e1e-e9e55614f1c6" xlink:to="loc_srt_ProductOrServiceAxis_16f19597-92ca-4983-9977-ef1831e8abf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_16f19597-92ca-4983-9977-ef1831e8abf6_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_16f19597-92ca-4983-9977-ef1831e8abf6" xlink:to="loc_srt_ProductsAndServicesDomain_16f19597-92ca-4983-9977-ef1831e8abf6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_eb1fd1b1-6729-4bef-9354-8a5be16bf301" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_16f19597-92ca-4983-9977-ef1831e8abf6" xlink:to="loc_srt_ProductsAndServicesDomain_eb1fd1b1-6729-4bef-9354-8a5be16bf301" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ProprietaryBrandSalesMember_463b9bbf-1e44-498c-a5bf-b6971c6e95c5" xlink:href="grwg-20251231.xsd#grwg_ProprietaryBrandSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_eb1fd1b1-6729-4bef-9354-8a5be16bf301" xlink:to="loc_grwg_ProprietaryBrandSalesMember_463b9bbf-1e44-498c-a5bf-b6971c6e95c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_NonProprietaryBrandSalesMember_a0d9abfa-81b4-4793-b6cb-43467521dd51" xlink:href="grwg-20251231.xsd#grwg_NonProprietaryBrandSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_eb1fd1b1-6729-4bef-9354-8a5be16bf301" xlink:to="loc_grwg_NonProprietaryBrandSalesMember_a0d9abfa-81b4-4793-b6cb-43467521dd51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_CommercialFixtureSalesMember_a51a7123-6de7-431c-ad67-10dd0af0779a" xlink:href="grwg-20251231.xsd#grwg_CommercialFixtureSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_eb1fd1b1-6729-4bef-9354-8a5be16bf301" xlink:to="loc_grwg_CommercialFixtureSalesMember_a51a7123-6de7-431c-ad67-10dd0af0779a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ConsumablesMember_e75eb3af-5ea9-4069-bacd-fb49ded2ae30" xlink:href="grwg-20251231.xsd#grwg_ConsumablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_eb1fd1b1-6729-4bef-9354-8a5be16bf301" xlink:to="loc_grwg_ConsumablesMember_e75eb3af-5ea9-4069-bacd-fb49ded2ae30" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_DurablesMember_963c80fb-75cc-4907-8e77-dee8372f3c23" xlink:href="grwg-20251231.xsd#grwg_DurablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_eb1fd1b1-6729-4bef-9354-8a5be16bf301" xlink:to="loc_grwg_DurablesMember_963c80fb-75cc-4907-8e77-dee8372f3c23" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_7ef1c442-ee7b-4af6-9a0b-0ec8beb7e869" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_76b2f725-1a79-4be1-8e1e-e9e55614f1c6" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_7ef1c442-ee7b-4af6-9a0b-0ec8beb7e869" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_7ef1c442-ee7b-4af6-9a0b-0ec8beb7e869_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7ef1c442-ee7b-4af6-9a0b-0ec8beb7e869" xlink:to="loc_us-gaap_SegmentDomain_7ef1c442-ee7b-4af6-9a0b-0ec8beb7e869_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ae6f7e63-3ea5-4d16-a62e-25b0b9009939" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7ef1c442-ee7b-4af6-9a0b-0ec8beb7e869" xlink:to="loc_us-gaap_SegmentDomain_ae6f7e63-3ea5-4d16-a62e-25b0b9009939" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_CultivationAndGardeningMember_288318c8-935c-46e4-bab1-9f5960f2194c" xlink:href="grwg-20251231.xsd#grwg_CultivationAndGardeningMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ae6f7e63-3ea5-4d16-a62e-25b0b9009939" xlink:to="loc_grwg_CultivationAndGardeningMember_288318c8-935c-46e4-bab1-9f5960f2194c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_StorageSolutionsMember_a28585e4-6d31-408e-95dc-ef24566953f6" xlink:href="grwg-20251231.xsd#grwg_StorageSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ae6f7e63-3ea5-4d16-a62e-25b0b9009939" xlink:to="loc_grwg_StorageSolutionsMember_a28585e4-6d31-408e-95dc-ef24566953f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_b1c59ca5-140f-45f3-bdee-3178537da91d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_189d3f46-cadc-4114-a94f-c1b705c85174" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_b1c59ca5-140f-45f3-bdee-3178537da91d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/SEGMENTSScheduleofSegmentInformationDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#SEGMENTSScheduleofSegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/SEGMENTSScheduleofSegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_75c8e805-c7ec-4d6b-8f00-7ea6b3d2b01f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_0dd6e590-d4f4-45e2-96a4-c21ae1ea4499" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75c8e805-c7ec-4d6b-8f00-7ea6b3d2b01f" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_0dd6e590-d4f4-45e2-96a4-c21ae1ea4499" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_260e0bdd-830f-4a82-8d0d-f683caea8461" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_0dd6e590-d4f4-45e2-96a4-c21ae1ea4499" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_260e0bdd-830f-4a82-8d0d-f683caea8461" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_260e0bdd-830f-4a82-8d0d-f683caea8461_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_260e0bdd-830f-4a82-8d0d-f683caea8461" xlink:to="loc_us-gaap_SegmentDomain_260e0bdd-830f-4a82-8d0d-f683caea8461_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_9913c41f-f787-4379-ab97-4ddf88b18c92" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_260e0bdd-830f-4a82-8d0d-f683caea8461" xlink:to="loc_us-gaap_SegmentDomain_9913c41f-f787-4379-ab97-4ddf88b18c92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_CultivationAndGardeningMember_67c5f203-312d-42c5-a5bb-765e64230a1d" xlink:href="grwg-20251231.xsd#grwg_CultivationAndGardeningMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_9913c41f-f787-4379-ab97-4ddf88b18c92" xlink:to="loc_grwg_CultivationAndGardeningMember_67c5f203-312d-42c5-a5bb-765e64230a1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_StorageSolutionsMember_f29d320b-e883-4fd8-9af1-a6bbfb44acfc" xlink:href="grwg-20251231.xsd#grwg_StorageSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_9913c41f-f787-4379-ab97-4ddf88b18c92" xlink:to="loc_grwg_StorageSolutionsMember_f29d320b-e883-4fd8-9af1-a6bbfb44acfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_ffaa0c5d-5c56-4b0b-aa60-b108a5d5789f" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_0dd6e590-d4f4-45e2-96a4-c21ae1ea4499" xlink:to="loc_srt_ConsolidationItemsAxis_ffaa0c5d-5c56-4b0b-aa60-b108a5d5789f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_ffaa0c5d-5c56-4b0b-aa60-b108a5d5789f_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_ffaa0c5d-5c56-4b0b-aa60-b108a5d5789f" xlink:to="loc_srt_ConsolidationItemsDomain_ffaa0c5d-5c56-4b0b-aa60-b108a5d5789f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_0d7c766a-8881-495a-b654-96621f1b3e26" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_ffaa0c5d-5c56-4b0b-aa60-b108a5d5789f" xlink:to="loc_srt_ConsolidationItemsDomain_0d7c766a-8881-495a-b654-96621f1b3e26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_0e0ae3bf-28bd-42d8-9edf-07852f1b741c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_0d7c766a-8881-495a-b654-96621f1b3e26" xlink:to="loc_us-gaap_OperatingSegmentsMember_0e0ae3bf-28bd-42d8-9edf-07852f1b741c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019cd494-cf8d-7c05-81db-53888448c0ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_0d7c766a-8881-495a-b654-96621f1b3e26" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019cd494-cf8d-7c05-81db-53888448c0ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_d77c457d-9ac9-461d-976c-4ac05c6de1fe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75c8e805-c7ec-4d6b-8f00-7ea6b3d2b01f" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_d77c457d-9ac9-461d-976c-4ac05c6de1fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_9d35a9fa-03af-4326-ae1c-c4ecd247d7aa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75c8e805-c7ec-4d6b-8f00-7ea6b3d2b01f" xlink:to="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_9d35a9fa-03af-4326-ae1c-c4ecd247d7aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_9a2ce7c2-f177-48f6-9db6-0b3eecb56e1d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75c8e805-c7ec-4d6b-8f00-7ea6b3d2b01f" xlink:to="loc_us-gaap_GrossProfit_9a2ce7c2-f177-48f6-9db6-0b3eecb56e1d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_428e5cb8-a2bf-40df-95f9-25c0ebeeac1b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75c8e805-c7ec-4d6b-8f00-7ea6b3d2b01f" xlink:to="loc_us-gaap_OperatingExpensesAbstract_428e5cb8-a2bf-40df-95f9-25c0ebeeac1b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingCostsAndExpensesAbstract_950d5b48-7dc2-48bd-8219-bb9e59339cfd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingCostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_428e5cb8-a2bf-40df-95f9-25c0ebeeac1b" xlink:to="loc_us-gaap_OperatingCostsAndExpensesAbstract_950d5b48-7dc2-48bd-8219-bb9e59339cfd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_ca5fad98-62dd-4c11-9515-d1f9da6f73a1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingCostsAndExpensesAbstract_950d5b48-7dc2-48bd-8219-bb9e59339cfd" xlink:to="loc_us-gaap_LaborAndRelatedExpense_ca5fad98-62dd-4c11-9515-d1f9da6f73a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_FacilityExpenses_7d9c8029-7cf3-4492-ba41-1bd6395d1203" xlink:href="grwg-20251231.xsd#grwg_FacilityExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingCostsAndExpensesAbstract_950d5b48-7dc2-48bd-8219-bb9e59339cfd" xlink:to="loc_grwg_FacilityExpenses_7d9c8029-7cf3-4492-ba41-1bd6395d1203" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_ExternalServiceProvidersExpenses_f2c5f800-94fa-4279-81d4-e88d97437f13" xlink:href="grwg-20251231.xsd#grwg_ExternalServiceProvidersExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingCostsAndExpensesAbstract_950d5b48-7dc2-48bd-8219-bb9e59339cfd" xlink:to="loc_grwg_ExternalServiceProvidersExpenses_f2c5f800-94fa-4279-81d4-e88d97437f13" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_842c1b7a-69e0-495c-89d4-4f1be2d0702d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingCostsAndExpensesAbstract_950d5b48-7dc2-48bd-8219-bb9e59339cfd" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_842c1b7a-69e0-495c-89d4-4f1be2d0702d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingCostsAndExpenses_029262b3-46ce-4460-998a-83cf380a6614" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingCostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingCostsAndExpensesAbstract_950d5b48-7dc2-48bd-8219-bb9e59339cfd" xlink:to="loc_us-gaap_OperatingCostsAndExpenses_029262b3-46ce-4460-998a-83cf380a6614" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpensesAbstract_3ec272c0-8573-4b14-a1a9-7d6fff548f35" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_428e5cb8-a2bf-40df-95f9-25c0ebeeac1b" xlink:to="loc_us-gaap_OtherExpensesAbstract_3ec272c0-8573-4b14-a1a9-7d6fff548f35" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_458c02b1-9bf5-40f3-963e-a2c18276829f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherExpensesAbstract_3ec272c0-8573-4b14-a1a9-7d6fff548f35" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_458c02b1-9bf5-40f3-963e-a2c18276829f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_139ef5b3-6908-4ba0-b502-5a71e175bc09" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherExpensesAbstract_3ec272c0-8573-4b14-a1a9-7d6fff548f35" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_139ef5b3-6908-4ba0-b502-5a71e175bc09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_60cabaee-d679-4c3c-a634-12f2ab0969ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherExpensesAbstract_3ec272c0-8573-4b14-a1a9-7d6fff548f35" xlink:to="loc_us-gaap_DepreciationAndAmortization_60cabaee-d679-4c3c-a634-12f2ab0969ca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_01d62d0d-b94e-4bfc-9142-3dda6623ed38" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillAndIntangibleAssetImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherExpensesAbstract_3ec272c0-8573-4b14-a1a9-7d6fff548f35" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_01d62d0d-b94e-4bfc-9142-3dda6623ed38" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_59ff200d-983c-4bb2-b2aa-dea216b2b74f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherExpensesAbstract_3ec272c0-8573-4b14-a1a9-7d6fff548f35" xlink:to="loc_us-gaap_OperatingExpenses_59ff200d-983c-4bb2-b2aa-dea216b2b74f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_eed3e1dd-85d4-4d82-88e6-dd42b58ae745" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75c8e805-c7ec-4d6b-8f00-7ea6b3d2b01f" xlink:to="loc_us-gaap_OperatingIncomeLoss_eed3e1dd-85d4-4d82-88e6-dd42b58ae745" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_2020bd9e-71e3-456c-904c-729e705ecaa5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75c8e805-c7ec-4d6b-8f00-7ea6b3d2b01f" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_2020bd9e-71e3-456c-904c-729e705ecaa5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_c942cc3e-c442-49d3-b640-4fe2377551a3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_75c8e805-c7ec-4d6b-8f00-7ea6b3d2b01f" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_c942cc3e-c442-49d3-b640-4fe2377551a3" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/COMMITMENTSANDCONTINGENCIESDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#COMMITMENTSANDCONTINGENCIESDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/COMMITMENTSANDCONTINGENCIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_6474a520-be67-4475-84d5-660a48aa33ff" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_eaab9f63-55c6-4746-9ff1-85ccced35a11" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_6474a520-be67-4475-84d5-660a48aa33ff" xlink:to="loc_us-gaap_LossContingenciesTable_eaab9f63-55c6-4746-9ff1-85ccced35a11" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_231862cb-bc48-4990-83a2-11f01b961caf" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_eaab9f63-55c6-4746-9ff1-85ccced35a11" xlink:to="loc_srt_LitigationCaseAxis_231862cb-bc48-4990-83a2-11f01b961caf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_231862cb-bc48-4990-83a2-11f01b961caf_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_231862cb-bc48-4990-83a2-11f01b961caf" xlink:to="loc_srt_LitigationCaseTypeDomain_231862cb-bc48-4990-83a2-11f01b961caf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_6f25b4a2-53b0-4c04-8d5e-89fbd29e65ca" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_231862cb-bc48-4990-83a2-11f01b961caf" xlink:to="loc_srt_LitigationCaseTypeDomain_6f25b4a2-53b0-4c04-8d5e-89fbd29e65ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_CaliforniaDisputesMember_019cd49d-e5d6-7a65-8c6e-bddd857d6e4d" xlink:href="grwg-20251231.xsd#grwg_CaliforniaDisputesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_6f25b4a2-53b0-4c04-8d5e-89fbd29e65ca" xlink:to="loc_grwg_CaliforniaDisputesMember_019cd49d-e5d6-7a65-8c6e-bddd857d6e4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_GrowGenerationCorpVsTGCSystemsLLCMember_99ba1cfa-045e-48da-a59f-02d18afc0134" xlink:href="grwg-20251231.xsd#grwg_GrowGenerationCorpVsTGCSystemsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_6f25b4a2-53b0-4c04-8d5e-89fbd29e65ca" xlink:to="loc_grwg_GrowGenerationCorpVsTGCSystemsLLCMember_99ba1cfa-045e-48da-a59f-02d18afc0134" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_06adc03b-c6b3-4501-ba2a-66c9c3dd6469" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_eaab9f63-55c6-4746-9ff1-85ccced35a11" xlink:to="loc_us-gaap_LitigationStatusAxis_06adc03b-c6b3-4501-ba2a-66c9c3dd6469" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_06adc03b-c6b3-4501-ba2a-66c9c3dd6469_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_06adc03b-c6b3-4501-ba2a-66c9c3dd6469" xlink:to="loc_us-gaap_LitigationStatusDomain_06adc03b-c6b3-4501-ba2a-66c9c3dd6469_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_30e7245a-b8c2-4631-8d86-c7a1d8f173fd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_06adc03b-c6b3-4501-ba2a-66c9c3dd6469" xlink:to="loc_us-gaap_LitigationStatusDomain_30e7245a-b8c2-4631-8d86-c7a1d8f173fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PendingLitigationMember_58688dbb-3958-4689-bd35-33462f653efd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PendingLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_30e7245a-b8c2-4631-8d86-c7a1d8f173fd" xlink:to="loc_us-gaap_PendingLitigationMember_58688dbb-3958-4689-bd35-33462f653efd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyPendingClaimsNumber_019cd49e-9560-74db-a237-5eed1b7359d1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LossContingencyPendingClaimsNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_6474a520-be67-4475-84d5-660a48aa33ff" xlink:to="loc_us-gaap_LossContingencyPendingClaimsNumber_019cd49e-9560-74db-a237-5eed1b7359d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019cd49c-c3fd-75d8-90de-1e5128967ed5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_6474a520-be67-4475-84d5-660a48aa33ff" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019cd49c-c3fd-75d8-90de-1e5128967ed5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLossCurrent_41c68cff-5649-4f9e-a749-013bf44d090c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_6474a520-be67-4475-84d5-660a48aa33ff" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLossCurrent_41c68cff-5649-4f9e-a749-013bf44d090c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForLegalSettlements_9798324c-0d01-4d2f-924e-d058129c210d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsForLegalSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_6474a520-be67-4475-84d5-660a48aa33ff" xlink:to="loc_us-gaap_PaymentsForLegalSettlements_9798324c-0d01-4d2f-924e-d058129c210d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLegalSettlements_e3b76081-9e42-4eab-a080-046044c3c4e6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromLegalSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_6474a520-be67-4475-84d5-660a48aa33ff" xlink:to="loc_us-gaap_ProceedsFromLegalSettlements_e3b76081-9e42-4eab-a080-046044c3c4e6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterestCurrent_2471562b-a13e-4e8b-a723-cb570daf4bf2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterestCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_6474a520-be67-4475-84d5-660a48aa33ff" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterestCurrent_2471562b-a13e-4e8b-a723-cb570daf4bf2" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/RESTRUCTURINGScheduleofRestructuringCostsDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#RESTRUCTURINGScheduleofRestructuringCostsDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/RESTRUCTURINGScheduleofRestructuringCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_8c483fb4-6ad4-43db-9d81-651a35d0630b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_090e5386-3a4b-4c37-b858-99c13344bf7c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_8c483fb4-6ad4-43db-9d81-651a35d0630b" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_090e5386-3a4b-4c37-b858-99c13344bf7c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_3c30cfd8-73be-49ab-98ad-23c42d297f8f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_090e5386-3a4b-4c37-b858-99c13344bf7c" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_3c30cfd8-73be-49ab-98ad-23c42d297f8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_3c30cfd8-73be-49ab-98ad-23c42d297f8f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3c30cfd8-73be-49ab-98ad-23c42d297f8f" xlink:to="loc_us-gaap_SegmentDomain_3c30cfd8-73be-49ab-98ad-23c42d297f8f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_7f0f0534-3bb5-4c27-bc2b-520f39d593af" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3c30cfd8-73be-49ab-98ad-23c42d297f8f" xlink:to="loc_us-gaap_SegmentDomain_7f0f0534-3bb5-4c27-bc2b-520f39d593af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_CultivationAndGardeningMember_221e3a70-2c5d-41c5-97cd-15e3e2c9ecd8" xlink:href="grwg-20251231.xsd#grwg_CultivationAndGardeningMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_7f0f0534-3bb5-4c27-bc2b-520f39d593af" xlink:to="loc_grwg_CultivationAndGardeningMember_221e3a70-2c5d-41c5-97cd-15e3e2c9ecd8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_41d21e9d-8a00-47d2-abe9-e5ddd26be298" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_090e5386-3a4b-4c37-b858-99c13344bf7c" xlink:to="loc_us-gaap_RestructuringPlanAxis_41d21e9d-8a00-47d2-abe9-e5ddd26be298" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_41d21e9d-8a00-47d2-abe9-e5ddd26be298_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_41d21e9d-8a00-47d2-abe9-e5ddd26be298" xlink:to="loc_us-gaap_RestructuringPlanDomain_41d21e9d-8a00-47d2-abe9-e5ddd26be298_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_7b377091-58e4-4f26-8551-d6e22313d095" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_41d21e9d-8a00-47d2-abe9-e5ddd26be298" xlink:to="loc_us-gaap_RestructuringPlanDomain_7b377091-58e4-4f26-8551-d6e22313d095" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_StrategicRestructuringPlanMember_e7a34edf-35ca-4e9d-af53-25ee31c6b7fb" xlink:href="grwg-20251231.xsd#grwg_StrategicRestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_7b377091-58e4-4f26-8551-d6e22313d095" xlink:to="loc_grwg_StrategicRestructuringPlanMember_e7a34edf-35ca-4e9d-af53-25ee31c6b7fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019bb935-8f0f-7306-8fb8-53f5bec8fc3d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_090e5386-3a4b-4c37-b858-99c13344bf7c" xlink:to="loc_srt_ConsolidationItemsAxis_019bb935-8f0f-7306-8fb8-53f5bec8fc3d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019bb935-8f0f-7306-8fb8-53f5bec8fc3d_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019bb935-8f0f-7306-8fb8-53f5bec8fc3d" xlink:to="loc_srt_ConsolidationItemsDomain_019bb935-8f0f-7306-8fb8-53f5bec8fc3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019bb935-8f0f-7d89-bc5c-a1d75848efcd" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019bb935-8f0f-7306-8fb8-53f5bec8fc3d" xlink:to="loc_srt_ConsolidationItemsDomain_019bb935-8f0f-7d89-bc5c-a1d75848efcd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019bb935-8f0f-71ef-8c63-e537e1e06a22" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019bb935-8f0f-7d89-bc5c-a1d75848efcd" xlink:to="loc_us-gaap_OperatingSegmentsMember_019bb935-8f0f-71ef-8c63-e537e1e06a22" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019bb935-8f0f-7c72-afd6-e218ca189529" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019bb935-8f0f-7d89-bc5c-a1d75848efcd" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019bb935-8f0f-7c72-afd6-e218ca189529" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019bb935-8f0f-7c19-b253-f79cf1448d45" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_090e5386-3a4b-4c37-b858-99c13344bf7c" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019bb935-8f0f-7c19-b253-f79cf1448d45" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019bb935-8f0f-7c19-b253-f79cf1448d45_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019bb935-8f0f-7c19-b253-f79cf1448d45" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019bb935-8f0f-7c19-b253-f79cf1448d45_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019bb935-8f0f-7687-bc86-1aeda6a1c7d8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019bb935-8f0f-7c19-b253-f79cf1448d45" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019bb935-8f0f-7687-bc86-1aeda6a1c7d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_019bb935-8f0f-7ec3-9dcd-dade436d653c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019bb935-8f0f-7687-bc86-1aeda6a1c7d8" xlink:to="loc_us-gaap_CostOfSalesMember_019bb935-8f0f-7ec3-9dcd-dade436d653c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_GrossProfitMember_019bb935-8f0f-71f7-b50f-d4b3d50f0ef8" xlink:href="grwg-20251231.xsd#grwg_GrossProfitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019bb935-8f0f-7687-bc86-1aeda6a1c7d8" xlink:to="loc_grwg_GrossProfitMember_019bb935-8f0f-71f7-b50f-d4b3d50f0ef8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenseMember_019bb935-8f0f-7da3-a1ed-8170961cf327" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019bb935-8f0f-7687-bc86-1aeda6a1c7d8" xlink:to="loc_us-gaap_OperatingExpenseMember_019bb935-8f0f-7da3-a1ed-8170961cf327" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_019bb935-8f0f-7f44-8c96-70a45236caf5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019bb935-8f0f-7687-bc86-1aeda6a1c7d8" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_019bb935-8f0f-7f44-8c96-70a45236caf5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_GoodwillAndIntangibleAssetImpairmentMember_019bb935-8f0f-74a8-9d66-581fc029fb62" xlink:href="grwg-20251231.xsd#grwg_GoodwillAndIntangibleAssetImpairmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019bb935-8f0f-7687-bc86-1aeda6a1c7d8" xlink:to="loc_grwg_GoodwillAndIntangibleAssetImpairmentMember_019bb935-8f0f-74a8-9d66-581fc029fb62" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_019bb935-8f0f-7f9d-8293-9384088dab51" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherNonoperatingIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019bb935-8f0f-7687-bc86-1aeda6a1c7d8" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_019bb935-8f0f-7f9d-8293-9384088dab51" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringSettlementAndImpairmentProvisions_019bb935-8f0f-7b5a-bc13-a5b12710f8ba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringSettlementAndImpairmentProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_8c483fb4-6ad4-43db-9d81-651a35d0630b" xlink:to="loc_us-gaap_RestructuringSettlementAndImpairmentProvisions_019bb935-8f0f-7b5a-bc13-a5b12710f8ba" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://growgeneration.com/role/RESTRUCTURINGScheduleofRestructuringCostsareincludedinAccruedExpensesDetails" xlink:type="simple" xlink:href="grwg-20251231.xsd#RESTRUCTURINGScheduleofRestructuringCostsareincludedinAccruedExpensesDetails"/>
  <link:definitionLink xlink:role="http://growgeneration.com/role/RESTRUCTURINGScheduleofRestructuringCostsareincludedinAccruedExpensesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_6bea8952-f05d-4266-aee5-808748844880" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5d3278fd-b7f0-4119-b321-f506c4eeb298" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_6bea8952-f05d-4266-aee5-808748844880" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5d3278fd-b7f0-4119-b321-f506c4eeb298" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_776cdc6b-03a2-40b1-a11c-5e2b508a3f5b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5d3278fd-b7f0-4119-b321-f506c4eeb298" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_776cdc6b-03a2-40b1-a11c-5e2b508a3f5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_776cdc6b-03a2-40b1-a11c-5e2b508a3f5b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_776cdc6b-03a2-40b1-a11c-5e2b508a3f5b" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_776cdc6b-03a2-40b1-a11c-5e2b508a3f5b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_d03eeb6a-6c70-4987-b8e7-e4b01e048cb8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_776cdc6b-03a2-40b1-a11c-5e2b508a3f5b" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_d03eeb6a-6c70-4987-b8e7-e4b01e048cb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FacilityClosingMember_0e986c90-5bd6-4878-a495-0e91fdad2b77" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FacilityClosingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_d03eeb6a-6c70-4987-b8e7-e4b01e048cb8" xlink:to="loc_us-gaap_FacilityClosingMember_0e986c90-5bd6-4878-a495-0e91fdad2b77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SpecialTerminationBenefitsMember_2b03d286-97b1-4d84-9ee9-8961c407df59" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SpecialTerminationBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_d03eeb6a-6c70-4987-b8e7-e4b01e048cb8" xlink:to="loc_us-gaap_SpecialTerminationBenefitsMember_2b03d286-97b1-4d84-9ee9-8961c407df59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_ce7f19e9-db3c-4df6-93ad-848adf91ec0f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_d03eeb6a-6c70-4987-b8e7-e4b01e048cb8" xlink:to="loc_us-gaap_OtherRestructuringMember_ce7f19e9-db3c-4df6-93ad-848adf91ec0f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_5bb9c241-d4c7-4c2a-9f27-27f19d744861" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_6bea8952-f05d-4266-aee5-808748844880" xlink:to="loc_us-gaap_RestructuringReserveRollForward_5bb9c241-d4c7-4c2a-9f27-27f19d744861" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_7e12f337-14ff-4707-99df-cebeb1f061e5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_5bb9c241-d4c7-4c2a-9f27-27f19d744861" xlink:to="loc_us-gaap_RestructuringReserve_7e12f337-14ff-4707-99df-cebeb1f061e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_77d11701-5214-4c63-ac60-f612a7206a24" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_5bb9c241-d4c7-4c2a-9f27-27f19d744861" xlink:to="loc_us-gaap_RestructuringCharges_77d11701-5214-4c63-ac60-f612a7206a24" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grwg_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag_019cd4ad-fae3-7e8e-95db-3d4dc4dad217" xlink:href="grwg-20251231.xsd#grwg_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCharges_77d11701-5214-4c63-ac60-f612a7206a24" xlink:to="loc_grwg_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag_019cd4ad-fae3-7e8e-95db-3d4dc4dad217" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_41a78c02-50c9-46b2-bf73-830cd89ff3cd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_5bb9c241-d4c7-4c2a-9f27-27f19d744861" xlink:to="loc_us-gaap_PaymentsForRestructuring_41a78c02-50c9-46b2-bf73-830cd89ff3cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_6df1dc49-6814-448b-a804-432a9d3ed7ce" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-roles-2024.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetImpairment" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillAndIntangibleAssetImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetImpairment" xlink:type="arc" order="691"/>
  </link:definitionLink>
</link:linkbase>
