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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a06780-78d0-76ef-b8fb-12c3af0b97df,g:87ce80c9-4192-4814-b301-6c68363503a4-->
<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-20260911.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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_01a06780-78d0-7eb7-9c32-06dfe108a30e" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_EntitiesTable_01a06780-78d0-7eb7-9c32-06dfe108a30e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_01a06780-78d0-7c32-b53a-61286221ca9a" 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_01a06780-78d0-7eb7-9c32-06dfe108a30e" xlink:to="loc_dei_LegalEntityAxis_01a06780-78d0-7c32-b53a-61286221ca9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01a06780-78d0-7c32-b53a-61286221ca9a_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_01a06780-78d0-7c32-b53a-61286221ca9a" xlink:to="loc_dei_EntityDomain_01a06780-78d0-7c32-b53a-61286221ca9a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01a06780-78d0-7e73-85e9-6dd795999b97" 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_01a06780-78d0-7c32-b53a-61286221ca9a" xlink:to="loc_dei_EntityDomain_01a06780-78d0-7e73-85e9-6dd795999b97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_01a06780-78d0-7cb3-9948-0814b606072a" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_EntityCentralIndexKey_01a06780-78d0-7cb3-9948-0814b606072a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_01a06780-78d0-7d5e-ac00-881200cff81c" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_AmendmentFlag_01a06780-78d0-7d5e-ac00-881200cff81c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_01a06780-78d0-794a-bfe9-de9e083343b7" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_EntityEmergingGrowthCompany_01a06780-78d0-794a-bfe9-de9e083343b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_01a06780-78d0-7914-b77b-9aa42f2bbc21" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_TradingSymbol_01a06780-78d0-7914-b77b-9aa42f2bbc21" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_01a06780-78d0-779a-a73e-42580b88b67b" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_Security12bTitle_01a06780-78d0-779a-a73e-42580b88b67b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_01a06780-78d0-786a-a05b-f50033f02327" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_01a06780-78d0-786a-a05b-f50033f02327" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_01a06780-78d0-7d25-b6c1-7d896dce9887" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_PreCommencementTenderOffer_01a06780-78d0-7d25-b6c1-7d896dce9887" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_01a06780-78d0-7c05-909b-d42939dca59a" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_SolicitingMaterial_01a06780-78d0-7c05-909b-d42939dca59a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_01a06780-78d0-77f2-a573-23d9fd9028fb" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_WrittenCommunications_01a06780-78d0-77f2-a573-23d9fd9028fb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_01a06780-78d0-75cb-b19a-ac77e92f6b40" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_LocalPhoneNumber_01a06780-78d0-75cb-b19a-ac77e92f6b40" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_01a06780-78d0-7cf0-a56d-b22790603fe2" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_CityAreaCode_01a06780-78d0-7cf0-a56d-b22790603fe2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_01a06780-78d0-7f57-85cc-f7c94acf0d9b" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_EntityAddressPostalZipCode_01a06780-78d0-7f57-85cc-f7c94acf0d9b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_01a06780-78d0-7229-bbaa-0556da8552b7" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_EntityAddressStateOrProvince_01a06780-78d0-7229-bbaa-0556da8552b7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_01a06780-78d0-720d-a566-8365033e5249" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_EntityAddressCityOrTown_01a06780-78d0-720d-a566-8365033e5249" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_01a06780-78d0-72ef-89d7-10b1aa51d529" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_EntityAddressAddressLine1_01a06780-78d0-72ef-89d7-10b1aa51d529" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_01a06780-78d0-76e5-a378-ceac81c34f16" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_EntityTaxIdentificationNumber_01a06780-78d0-76e5-a378-ceac81c34f16" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_01a06780-78d0-7842-9c20-810e388f05d4" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_EntityFileNumber_01a06780-78d0-7842-9c20-810e388f05d4" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_01a06780-78d0-7fe4-9312-3d45e407fd3c" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_EntityIncorporationStateCountryCode_01a06780-78d0-7fe4-9312-3d45e407fd3c" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_01a06780-78d0-7c8b-9ef8-3652fdbed83e" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_EntityRegistrantName_01a06780-78d0-7c8b-9ef8-3652fdbed83e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_01a06780-78d0-704c-aa51-7c1de1960ebb" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_DocumentPeriodEndDate_01a06780-78d0-704c-aa51-7c1de1960ebb" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_01a06780-78d0-712f-9dbf-20d183180e81" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_DocumentType_01a06780-78d0-712f-9dbf-20d183180e81" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_01a06780-78d0-7349-9567-b8d26ca05af9" 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_01a06780-78d0-783b-b3ef-0204a946f52d" xlink:to="loc_dei_SecurityExchangeName_01a06780-78d0-7349-9567-b8d26ca05af9" xlink:type="arc" order="21"/>
  </link:definitionLink>
</link:linkbase>
