Missouri Amendment 3 (2022) allows adults 21+ with a cultivation identification card to grow up to 6 flowering plants, 6 nonflowering plants, and 6 clones at home. Plants must be in a locked, enclosed, non-public space. St. Louis cannot ban home cultivation by registered users.
Missouri Constitution Article XIV, Section 2, adopted as Amendment 3 in November 2022, legalized adult-use cannabis statewide and preserved the medical program. Adults 21 or older may apply to the Missouri Department of Health and Senior Services (DHSS) for a home cultivation identification card; medical patients may self-cultivate under the patient cultivation card. Cardholders may grow up to 6 flowering plants, 6 nonflowering plants over 14 inches, and 6 clones (under 14 inches) per person, and up to double that if two cardholders share a residence. Plants must be in a locked, enclosed facility not visible to the public or from a public place. Giving away up to 3 ounces to another adult is permitted. Municipalities including St. Louis cannot prohibit or require a separate permit for compliant home cultivation, but landlords may restrict cannabis use in leases.
Exceeding plant counts or cultivating without a card violates Article XIV and can be prosecuted under RSMo 579.015-579.097 as illegal manufacture, with penalties scaled to quantity.
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