Is weed legal in Missouri?

Recreational status

Recreational cannabis is legal in Missouri. (Missouri Constitution, Article XIV, Section 2)

Missouri runs an adult route and a patient route side by side, and turning 21 puts you on the adult one. A physician's certification is what moves you onto the patient allowances, which are counted differently.

Medical status

A full medical cannabis program runs in Missouri, serving patients the program registers. (Missouri Constitution, Article XIV, Section 1)

The qualifying-condition list in section 2(15) runs to cancer, epilepsy, glaucoma, intractable migraines, chronic pain or muscle spasms (including those from multiple sclerosis, seizures, Parkinson's disease, and Tourette's syndrome), debilitating psychiatric disorders including post-traumatic stress disorder, HIV/AIDS, any terminal illness, and, in a physician's professional judgment, any other chronic or debilitating condition, naming hepatitis C, ALS, inflammatory bowel disease, Crohn's disease, Huntington's disease, autism, neuropathies, sickle cell anemia, Alzheimer's-related agitation, cachexia, and wasting syndrome as examples -- a broad list with an open-ended physician-discretion clause, not a single low-THC indication.

Missouri writes a patient's possession as a supply of days and their buying as an amount every 30 days, so a card changes the arithmetic rather than the access. A physician certifies you first, and the state registers you after that.

Hemp-derived products

Missouri permits the sale of hemp-derived products that meet its definition of hemp. (Missouri Constitution, Article XIV, Section 2)

Both registered sources for this question define 'marijuana' to exclude industrial hemp and hemp-derived commodities or products, and neither states any further restriction -- no potency cap, age gate, or licensing requirement -- on the sale of hemp or hemp-derived products themselves. RSMo 195.010(28) draws the same exclusion for the Controlled Substances Law's definition of marijuana. Both sources define 'hemp' and 'industrial hemp' only by reference to RSMo 195.900, which is not among the register's sources for this question.

Hemp-derived products sit outside Missouri's definition of marijuana, so the ounce limits and the dispensary counters do not reach them. Nothing in the cited sources sets a potency cap or a separate age, which is a gap in what they say rather than a permission.

Home cultivation

Missouri allows an adult to grow up to 6 plants at home. (Missouri Constitution, Article XIV, Section 2)

The 6 flowering plants come with up to 6 nonflowering plants over fourteen inches tall and 6 clones under fourteen inches tall (18 total) per person registered with the department, kept at one private residence, locked, and out of public view; a residence may hold up to twice that number (36) if more than one person there is registered to cultivate. Article XIV, section 1(12) instead lets a qualifying patient or primary caregiver obtain a card to cultivate up to 6 flowering plants for that patient alone, capped at 12 flowering plants sharing one locked facility (18 if the caregiver is also a patient cultivating for themselves), under section 1(9).

The six are flowering plants, and Missouri registers a grower before any of them are lawful, so a plant grown without that registration is not covered. Everything stays at one private residence, locked and out of public view, and a second registered adult in the house raises the household ceiling rather than your own.

Possession and purchase limits

The possession limit, as Missouri states it: Three ounces or less of dried, unprocessed marijuana, or its equivalent. (Missouri Constitution, Article XIV, Section 2)

A person cultivating marijuana may also possess, in a locked space at the residence, any supply produced by their own plants beyond this three-ounce amount, under 19 CSR 100-1.040(4)(A)2. A qualifying patient who does not cultivate may instead possess up to a 60-day supply, or up to a 90-day supply if cultivating (or served by a cultivating caregiver), under 19 CSR 100-1.040(4)(B)3; a primary caregiver holds a separate limit for each patient under their care.

On buying, Missouri states: Consumers may only purchase up to three ounces of dried, unprocessed marijuana, or its equivalent, in a single transaction. (19 CSR 100-1.040: Consumers, Qualifying Patients, and Primary Caregivers)

Article XIV, section 2(10)(a) states the same three-ounce amount as one of the personal-use acts a person 21 or older may lawfully purchase, possess, or use. Absent a physician's certification authorizing more, a qualifying patient may instead purchase, or have a primary caregiver purchase on their behalf, up to six ounces every 30 days, under 19 CSR 100-1.040(4)(B)1.

The adult cap here is per transaction rather than per week or per month, and the possession figure counts an equivalent in other forms, not only flower. A registered grower may keep what their own plants produce above that amount, so long as it stays locked at the residence.

Minimum age

You must be 21 or over to buy without a medical card. (Missouri Constitution, Article XIV, Section 2)

You must be 18 or over to hold a card and buy for yourself. (Missouri Constitution, Article XIV, Section 1)

A physician may not issue a certification for a nonemancipated qualifying patient under the age of eighteen without the written consent of a parent or legal guardian, who acts as the patient's caregiver.

Missouri sets two ages because it runs two counters. Under 18 a card is still possible, but a parent or guardian consents in writing and then acts as the caregiver.

Where you can buy

You can buy lawfully from a licensed recreational dispensary, a licensed medical dispensary and a licensed delivery service. (Missouri Constitution, Article XIV, Section 2)

The same license authorizes sale to both a 'qualifying patient or primary caregiver' and 'a consumer,' and authorizes delivery 'to any address as directed by' any of them, under the 'comprehensive marijuana dispensary facility' and 'microbusiness dispensary facility' definitions in section 2(2). 19 CSR 100-1.180(1)(A)6 confirms this split: 'a medical dispensary licensee may only sell or distribute to individuals who are qualifying patients or primary caregivers,' while 'a comprehensive or microbusiness dispensary licensee may sell or distribute to individuals who are consumers, qualifying patients, or primary caregivers.'

A dispensary holding the comprehensive or microbusiness license can serve you whether or not you hold a card, while a medical-only licensee may sell to patients and caregivers alone. Delivery to an address you name is part of what those licenses cover.

The Missouri store list names every licensed location this site holds a record for.

Federal law applies here too, and it is not the same. Read what federal law says about weed.