How Many Plants Can You Grow Legally at Home?

There is no national number. The limit on how many plants you can grow legally at home comes from state law, not federal law, and it ranges from zero plants in some states to 12 or more per household in others. Five criteria decide your cap: the state you live in, whether you grow as a registered medical patient or an adult-use consumer, the maturity stage of each plant, how your state counts multiple adults in one home, and any city or county ordinance stacked on top of the state rule.

Where the number actually comes from

State statutes and the regulations written to enforce them set home cultivation limits. Federal law does not grant a plant count at all. Cannabis remains a Schedule I controlled substance under the Controlled Substances Act, so a home grow that is fully compliant with state law is still a federal offense on paper. Federal enforcement has in practice focused on large-scale trafficking and operations that violate state rules, which is why the practical answer for most people is a state statute and a local ordinance, checked together.

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Common state limits for adult-use home grows

These figures reflect adult-use rules in states that permit home cultivation. Legislative sessions change them, so confirm the current text before you plant.

California: up to 6 plants per private residence for adults 21 and older.
Colorado: 6 plants per adult, capped at 12 per household, with a limit on mature plants.
Oregon: 4 plants per household.
Washington: no recreational home grow; medical patients have a narrower allowance.
Massachusetts: 6 plants per adult, up to 12 per household.
Michigan: up to 12 plants per household.
Vermont: 2 mature and 4 immature plants per household.
Connecticut: 3 mature and 3 immature plants per household.
Maine: 6 mature plants per adult, capped at 12 mature per household.
Nevada: 6 plants per person, capped at 12 per household.

Several states that allow retail sales still prohibit home cultivation entirely. A legal dispensary purchase and a legal home grow are separate permissions, and one does not imply the other.

Medical patients usually get a higher plant count

Medical programs often allow more plants than the adult-use rule in the same state, and sometimes they allow a designated caregiver to grow on a patient's behalf. That higher count normally requires an active patient registration or card. Growing 12 plants as a cardholder when the adult-use limit is 6 means the card has to be current, and in some states it has to be posted or carried.

Mature, immature, and clones count too

Many statutes split the limit into mature and immature plants. A flowering plant typically counts as mature. A seedling or clone in a plug often does not, up to a ceiling. This matters at harvest and at propagation: taking 10 clones from 4 legal plants can put you over the immature cap even though your mature count never moved. Read the definitions section of your state's rule, not just the headline number.

Household aggregation and local rules

States aggregate in two different ways. Some set a per-person limit plus a per-household ceiling, so three adults in one home cannot each grow the full personal allowance. Others set a flat per-residence number that applies no matter how many adults live there. On top of that, cities and counties can ban outdoor cultivation, require a locked enclosure, restrict visibility from the street, or demand odor control. A state-legal grow can still produce a local citation.

Growing at home versus buying from a licensed retailer

Home cultivation

Pros: no per-gram cost after setup, control over strain and harvest timing, a known plant count that you can document.
Cons: a hard legal ceiling that varies by address, upfront equipment cost, odor and security obligations, and a federal prohibition that never went away.

Licensed retail purchase

Pros: no plant count to track, tested and labeled products, no local cultivation ordinance to satisfy, and no grow equipment to store.
Cons: ongoing cost per product, purchase limits per transaction, and availability that depends on the state's licensed market.

Use case: if you live in a state with a zero-plant home grow rule, or your lease, HOA, or city ordinance blocks cultivation, a licensed retailer is the workable route. If your state allows 6 to 12 plants and you have a secure, private space, growing at home is a legal option worth comparing against retail prices before you commit.

Steps to confirm your own number

Find your state's cultivation statute and current regulations, not a summary from an older news article.
Check whether you qualify under the medical rule, which frequently carries a higher count.
Read the definitions for mature, immature, and seedling, and count your clones.
Apply the household cap, not just the per-person number.
Search your city and county code for cultivation, odor, and enclosure rules.
Check your lease or HOA agreement, which can prohibit a grow that state law allows.

The short answer: your legal plant count is a single number set by your state and narrowed by your city and your lease. Any figure quoted without those three details is a guess.