Six. California adults 21 and older can grow up to six marijuana plants per private residence for personal use. The word that trips people up is residence, because the cap applies to the household, not the human. Four roommates who are all over 21 do not get 24 plants. They get six total.
The statewide baseline
Proposition 64, passed by voters in 2016, put the six-plant number into state law. Health and Safety Code 11362.2 fills in the rest:
How Many Plants Can I Grow Legally in Colorado?
- No more than six living plants may be planted, cultivated, harvested, dried, or processed at one residence at any given time.
- The grow has to sit in a locked space, indoors or out.
- Plants cannot be visible from a public place without binoculars, aircraft, or another optical aid.
- Cultivation happens at a private residence, not a vacant lot, warehouse, or commercial building.
- Selling any of it stays illegal. Giving away up to 28.5 grams to another adult 21 or older, with no payment, is allowed.
A separate license from the Department of Cannabis Control is required for commercial cultivation, and no personal grow exemption covers that kind of volume.
legal cannabis plant limit by state
Your city or county has the final say
California hands local governments broad authority over cultivation, and plenty of them use it. A city can ban outdoor grows outright, require everything to move indoors, cap you below six plants, or ask you to register the grow and pay a permit fee. Some jurisdictions have gone further and banned all personal cultivation, which is legally shaky but still enforced at the local level.
states with unlimited cannabis plant count
Renters have one more layer. A landlord can prohibit cultivation in a lease, and violating that clause is a tenancy problem even when the state plant count is fine.
Medical patients get more room
A doctor's recommendation changes the math in many places. The state's medical cannabis ID card program lets patients document their status, and local ordinances often allow patients more plants than the recreational six. A common split in city codes is six mature or twelve immature plants per patient. That number depends on where you live and whether the ordinance mentions patients at all, so the county code is the document that matters.
What counts as a plant
Clones count. Seedlings count. If you keep mother plants and rooted cuttings going in a tent, those are living plants under the statute and they eat into your six. This surprises people who assume only flowering plants matter, and it is one of the easiest ways to drift over the limit without noticing.
The convenience question
Here is the part the six-plant rule does not tell you. Six plants take three to five months from seed to jar, plus lights, water, odor control, and a space nobody else needs to use. Storefront pickup and same-day delivery in most metro areas take under an hour. For a lot of households the legal allowance is a hobby, not a supply plan, and convenience is what decides whether the tent ever gets set up.
Quick checklist before you plant
- Confirm you are 21 or older and the grow is at a private residence.
- Read your city and county cultivation ordinance, not just the state law.
- Count every living plant, including clones and mothers.
- Lock the space and screen it from public view.
- Check your lease or HOA rules if you rent or live in a planned community.