The number most people need
In Colorado, adults 21 and older may grow up to six marijuana plants per person. A single home, though, is capped at 12 plants total, no matter how many adults live there. Of the six plants one person is allowed, only three may be mature and flowering at the same time.
So a two-adult household tops out at 12 plants. A four-adult household also tops out at 12. That gap between "per person" and "per home" is where most people get it wrong.
states with unlimited cannabis plant count
- 1 adult: 6 plants, 3 mature
- 2 adults: 12 plants, 6 mature
- 3 or more adults: still 12 plants
What the state requires of a home grow
The plant count is only one piece. Colorado also cares about where those plants sit and who can see them.
- You must be 21 or older for a recreational home grow.
- Plants have to be in an enclosed, locked space.
- They cannot be open to public view.
- You cannot sell what you harvest. Adults may gift small amounts to other adults, but sales are off the table.
- Cities and counties may ban or further restrict home cultivation, so the state number is a ceiling, not a guarantee.
Medical patients follow a different set of numbers
Registered medical marijuana patients are not working off the six-and-12 recreational rule. Plant counts come from the state's medical program and the patient's recommendation, and caregivers who grow for more than one patient do so under separate conditions. Medical home grows also carry extra location restrictions. If you hold a red card, check the medical rules first rather than assuming the recreational count applies to you.
Renters, leases, and city codes
A landlord can prohibit cultivation in a lease even where state law permits it, and plenty of Colorado leases do. Municipal codes vary just as much. Some towns allow the full 12 plants, others tightened or banned home grows after the state changed the household cap in 2021. Look up your city or county code before you spend money on lights and a tent, because that local rule is the one that actually governs your address.
Why convenience keeps most home grows tiny
From the retail side, the reason most Colorado adults never come close to six plants is simple: a dispensary is a short drive, delivery now reaches a large share of the state, and a legal eighth costs less than the electricity, nutrients, and four months of attention a real grow demands. Convenience wins that comparison almost every time.
Where home growing survives is with people who want a specific strain, a specific method, or who just enjoy the process. For that group, the compliant setup is boring on purpose: a locked room or tent, the plant count written on the wall, and a calendar marking the flip to flower. Boring is what keeps a hobby from turning into a citation.
Bottom line
Six plants per adult, 12 per household, three mature at a time, locked and out of sight, no sales, and local rules on top of all of it. Hit those marks and you are inside Colorado law.