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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019febe9-70f4-7509-9206-924dc76c444e,g:52486aeb-3e79-4eac-bb8f-6dd5b648443f-->
<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://www.scotts.com/role/DocumentandEntityInformationDocument" xlink:type="simple" xlink:href="smg-20261104.xsd#DocumentandEntityInformationDocument"/>
  <link:definitionLink xlink:role="http://www.scotts.com/role/DocumentandEntityInformationDocument" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_019febe9-70f4-75be-873c-21a65d0eee8d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_EntitiesTable_019febe9-70f4-75be-873c-21a65d0eee8d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019febe9-70f4-7212-9141-3ee2cf9bf869" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_019febe9-70f4-75be-873c-21a65d0eee8d" xlink:to="loc_dei_LegalEntityAxis_019febe9-70f4-7212-9141-3ee2cf9bf869" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019febe9-70f4-7212-9141-3ee2cf9bf869_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019febe9-70f4-7212-9141-3ee2cf9bf869" xlink:to="loc_dei_EntityDomain_019febe9-70f4-7212-9141-3ee2cf9bf869_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019febe9-70f4-74f9-b14f-7ae9404d97a3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019febe9-70f4-7212-9141-3ee2cf9bf869" xlink:to="loc_dei_EntityDomain_019febe9-70f4-74f9-b14f-7ae9404d97a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019febe9-70f4-7999-ad34-c275aae19df9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_AmendmentFlag_019febe9-70f4-7999-ad34-c275aae19df9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019febe9-70f4-713e-a29c-275dee1c4699" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_EntityEmergingGrowthCompany_019febe9-70f4-713e-a29c-275dee1c4699" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019febe9-70f4-79f8-ad36-5aad78df3b7b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019febe9-70f4-79f8-ad36-5aad78df3b7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019febe9-70f4-7c80-ad08-1d0b3f87877e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_PreCommencementTenderOffer_019febe9-70f4-7c80-ad08-1d0b3f87877e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019febe9-70f4-7f96-8b76-faf163eebba4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_SolicitingMaterial_019febe9-70f4-7f96-8b76-faf163eebba4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019febe9-70f4-781e-aa94-2d1c19c058f9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_WrittenCommunications_019febe9-70f4-781e-aa94-2d1c19c058f9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019febe9-70f4-7ecf-b63b-b3f6a35199e3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_SecurityExchangeName_019febe9-70f4-7ecf-b63b-b3f6a35199e3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019febe9-70f4-791b-84f1-7fb8cd7202d5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_TradingSymbol_019febe9-70f4-791b-84f1-7fb8cd7202d5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019febe9-70f4-74ea-87c0-e42546545758" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_Security12bTitle_019febe9-70f4-74ea-87c0-e42546545758" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019febe9-70f4-757a-b0fa-d3d70242e447" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_LocalPhoneNumber_019febe9-70f4-757a-b0fa-d3d70242e447" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019febe9-70f4-7e26-af51-7602e56694ca" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_CityAreaCode_019febe9-70f4-7e26-af51-7602e56694ca" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019febe9-70f4-7a76-93f2-506cb016f42c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_EntityAddressPostalZipCode_019febe9-70f4-7a76-93f2-506cb016f42c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019febe9-70f4-7975-908f-2dac36368d66" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_EntityAddressStateOrProvince_019febe9-70f4-7975-908f-2dac36368d66" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019febe9-70f4-7b60-88a9-516acf7d7eb9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_EntityAddressCityOrTown_019febe9-70f4-7b60-88a9-516acf7d7eb9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019febe9-70f4-757e-b08a-064352bb249f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_EntityAddressAddressLine1_019febe9-70f4-757e-b08a-064352bb249f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019febe9-70f4-77aa-b809-b9f0de4f5e2d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_EntityTaxIdentificationNumber_019febe9-70f4-77aa-b809-b9f0de4f5e2d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019febe9-70f4-74de-940d-235feee903e2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_EntityFileNumber_019febe9-70f4-74de-940d-235feee903e2" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019febe9-70f4-7b39-9dea-32aa7cca2464" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019febe9-70f4-7b39-9dea-32aa7cca2464" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019febe9-70f4-787c-b90d-72f525e38a0b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_EntityRegistrantName_019febe9-70f4-787c-b90d-72f525e38a0b" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019febe9-70f4-762f-baab-3fd7d006ff57" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_DocumentType_019febe9-70f4-762f-baab-3fd7d006ff57" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019febe9-70f4-7004-a523-5c349abbbbf1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_DocumentPeriodEndDate_019febe9-70f4-7004-a523-5c349abbbbf1" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019febe9-70f4-76f2-9c51-2909f62ed7ba" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019febe9-70f4-76b9-a0bb-b669727b6bc7" xlink:to="loc_dei_EntityCentralIndexKey_019febe9-70f4-76f2-9c51-2909f62ed7ba" xlink:type="arc" order="21"/>
  </link:definitionLink>
</link:linkbase>
