A licensed adult in Missouri can grow up to 18 cannabis plants at home: six flowering, six nonflowering plants that are 14 inches or taller, and six nonflowering plants under 14 inches.1Missouri Department of Health & Senior Services. Cultivation – Patient/Caregiver and Consumer You need a consumer personal cultivation license from the Missouri Department of Health and Senior Services (DHSS) before any of those plants goes into soil, and every plant has to stay in an enclosed, locked space at your residence. The framework comes from Article XIV of the Missouri Constitution, added by voter-approved Amendment 3 in 2022.
The 18-Plant Limit Per Licensed Adult
Each license holder gets three tiers of plants, defined by growth stage:
- Up to six flowering plants
- Up to six nonflowering plants that are at least 14 inches tall
- Up to six nonflowering plants under 14 inches tall
That’s 18 plants per person at any given time.1Missouri Department of Health & Senior Services. Cultivation – Patient/Caregiver and Consumer The tiers matter. Six mature flowering plants is the ceiling regardless of how well your garden is doing, and clones or seedlings that cross the 14-inch mark shift into a different bucket. If all six flowering slots are already full, the next plant to bloom pushes you over.
Household Cap When Two or More Adults Share the Home
If two licensed adults live in the same residence, the numbers double. The household can have 12 flowering plants, 12 nonflowering plants 14 inches or taller, and 12 nonflowering plants under 14 inches, for a total of 36.1Missouri Department of Health & Senior Services. Cultivation – Patient/Caregiver and Consumer
That 36-plant figure is a hard ceiling for the residence itself. Three or four licensed roommates under one roof still max out at 36. The license attaches to the person, but the cap attaches to the address.
Medical Patients and Caregivers
Individual limits for qualifying medical marijuana patients match the consumer numbers exactly: six flowering, six nonflowering 14 inches or taller, and six nonflowering under 14 inches. Two patients sharing a single cultivation space are capped at 12 flowering plants total.1Missouri Department of Health & Senior Services. Cultivation – Patient/Caregiver and Consumer
Primary caregivers who grow for multiple patients get more headroom: up to 24 flowering, 24 nonflowering plants 14 inches or taller, and 24 nonflowering plants under 14 inches. Even with that expanded allowance, a single cultivation space cannot hold more than 24 flowering plants at once.1Missouri Department of Health & Senior Services. Cultivation – Patient/Caregiver and Consumer
The License You Need Before You Plant
The plant count only applies if you have a consumer personal cultivation license. Growing without one is a felony in Missouri, regardless of the amount.
To qualify, you must be at least 21 and a Missouri resident. The application, filed through the DHSS online portal, requires your full legal name, residential address, Social Security number, date of birth, a color photo of your face taken within the prior three months (not a passport photo or a copy of your ID photo), and a readable copy of a government-issued photo ID.2Missouri Department of Health and Senior Services. Consumer Personal Cultivation Application You’ll also list the specific address where you plan to grow, and if another licensed adult will share that space, their name and license number.1Missouri Department of Health & Senior Services. Cultivation – Patient/Caregiver and Consumer
The application fee is $100, non-refundable. DHSS has 30 days from receipt of a complete application to approve or deny it. The license lasts 12 months and must be renewed annually, with the same documents and the same $100 fee.1Missouri Department of Health & Senior Services. Cultivation – Patient/Caregiver and Consumer Let it lapse and every plant on your property becomes unlicensed cultivation.
Where the Plants Have to Be Kept
The count is only half the rule. Every plant must be inside an enclosed, locked facility at your private residence: a stationary space such as a closet, dedicated room, garage, or greenhouse, with locks or security devices that limit access to you alone. Plants on a porch, a windowsill, or an open backyard do not qualify.
Outdoor grows have stricter structural requirements. The area must be an enclosed, stationary structure secured on all sides (the base excluded), built from materials like chain-link fencing or wooden slats, and anchored to the ground. The plants cannot be visible from a public road or sidewalk without binoculars, aircraft, or similar devices, and every flowering plant must carry a label with your name on it.1Missouri Department of Health & Senior Services. Cultivation – Patient/Caregiver and Consumer
Local governments can add their own rules on top of the state’s. Excelsior Springs, for example, caps grow lights at 1,000 watts each, requires ventilation to prevent mold and excessive humidity, and prohibits compressed gases like butane or CO₂ in cultivation areas. Check with your city or county code enforcement office before building out the space.
What Happens if You Grow Too Many
The consequences split sharply depending on whether you are licensed.
Over the Limit With a Valid License
If you have a license but exceed the plant count, or hold more harvested cannabis outside your secured grow area than allowed, penalties escalate with each offense:
- First violation: civil penalty of up to $250, plus forfeiture of the excess cannabis.
- Second violation: civil penalty of up to $500, plus forfeiture.
- Third or subsequent violation: misdemeanor, fine of up to $1,000, plus forfeiture.
Each violation is recorded with DHSS and can affect future renewals.
Growing Without a License
Cultivating any amount of cannabis in Missouri without a valid license is a felony, regardless of age or whether you would otherwise qualify:
- 35 grams or less: Class E felony, up to four years in prison and a fine of up to $10,000.
- More than 35 grams: Class C felony, three to ten years in prison and a fine of up to $10,000.
The gap between a $250 civil fine and a felony sentence turns entirely on whether the $100 license was in hand before planting.3Missouri Revisor of Statutes. Missouri Constitution Article XIV Section 2
Storing What You Grow
A licensed grower can carry up to three ounces of cannabis outside the home, the same amount as any adult in Missouri. Anything beyond three ounces has to stay at your residence, inside the same enclosed, locked facility where the plants live.1Missouri Department of Health & Senior Services. Cultivation – Patient/Caregiver and Consumer The constitution does not set a stated upper limit on how much finished cannabis you can keep at home, provided it came from your licensed plants and stays secured.