The Short Answer
The most common outdoor limit in the United States is 6 plants per adult or 12 plants per household, and the household cap controls when two adults share an address. Several states use 4 plants per household, a few allow more, and a long list allows no outdoor plants at all. There is no federal plant number to fall back on, because federal law prohibits cultivation outright. The criteria that decide your real count are your state statute, medical versus adult-use status, per-person versus per-household wording, local zoning, and security rules such as locked enclosures and public visibility.
How Many Cannabis Plants Can I Grow Without a License?
Why There Is No Federal Plant Number
Cannabis cultivation is prohibited under federal law, so no federal agency publishes an outdoor plant allowance you can cite. State programs exist as a matter of state law and state enforcement priorities, not because federal prohibition changed. That gap matters in practice. Growing on federal land, in federally assisted housing, or on property tied to a federal license carries risk a state plant count does not cover. Carrying plants or harvested flower across state lines also ends your state protection.
The Limits You Will See in State Law
Outdoor rules follow a handful of patterns, and the math changes depending on how many adults live at the address.
12 plants per household
- Colorado: 6 plants per adult 21 and older, capped at 12 per household. Outdoor plants must be in an enclosed, locked space that is not visible from public view.
- Michigan: 12 plants per household for adults 21 and older, kept in a locked space and out of public sight.
- Massachusetts: 6 plants per adult, 12 per household, with outdoor plants in a locked area neighbors cannot see without optical aids.
- New York: 6 plants per adult and 12 per household under the adult-use statute.
Use case: two adults in one house get 12 plants total, not 24. The household number is the ceiling.
How Many Cannabis Plants Can I Grow in California?
6 plants per household or per residence
- California: 6 plants per private residence for adults 21 and older. The count applies to the residence, so three adults at one address still share 6 plants. Medical patients may fall under different state medical rules and county guidelines.
- Nevada: 6 plants per adult and 12 per household when a retail cannabis store sits within 25 miles. Beyond that distance, the per-person allowance rises to 12. This is a good example of why the count is not just a number, it is tied to geography.
4 plants per household
Oregon allows 4 plants per household for adults 21 and older, not 4 per person, and the plants must stay out of public view. Registered medical patients grow under a separate count through the state health authority.
Medical only, or no outdoor grow
- Washington: no recreational home grow. Authorized medical patients may grow up to 6 plants, or up to 15 with a health care practitioner's authorization.
- Illinois: registered medical patients may grow up to 5 plants. Recreational home cultivation is not permitted.
- Florida and Texas: no home cultivation for recreational or medical patients under current state law.
Flowering versus total counts
Some states split the count by plant stage instead of giving one flat number. Maine, for example, counts flowering plants separately from immature plants and seedlings, so a household can hold a larger total than the flowering cap suggests. If your state uses stage-based counts, confirm which stage your plants are in before you add more.
What Decides Your Actual Number
- State statute, and whether you qualify as an adult 21 and older or as a registered medical patient.
- Per-person versus per-household language. When both appear, the lower number wins.
- City and county ordinances, which can be stricter than the state cap and often restrict outdoor grows in residential zones.
- Property status: renters, leased land, HOA rules, and public housing all add their own limits.
- Security and visibility requirements tied to the outdoor count.
- Distance rules from schools, parks, and childcare centers.
Rules That Come With an Outdoor Count
- A locked enclosure or fenced, secured area in most states that allow outdoor growing.
- No visibility from a public right of way or from a neighbor's property without aids.
- Plant tags and registry numbers for medical grows in several states.
- No resale, gifting above state limits, or sharing outside the allowed amount.
- Odor, water use, and light ordinances that apply at the local level.
Pros and Cons of Growing at the State Maximum
Pros
- More harvest from one outdoor season, which suits patients with a high monthly need.
- Room to lose a plant or two to weather, pests, or mold without losing the whole supply.
- Fewer seed purchases and less crop rotation planning across the year.
Cons
- Large outdoor plants are visible, and visibility rules are the most common reason home grows draw complaints.
- Twelve full-size plants demand serious space, trellising, water, and drying room.
- Compliance risk rises when a household treats a per-person number as a total.
Pros and Cons of a Smaller Outdoor Count
Pros
- Easier to keep plants hidden, secured, and within local ordinances.
- Lower water, nutrient, and labor cost per season.
- Drying and curing fit inside a normal home without odor problems.
Cons
- A single failed plant can cut your yield in half.
- Legal headroom goes unused if you later want more flower or concentrate.
Which Count Fits Your Situation
If you are a first-time outdoor grower in a 6-plant state, start with 2 to 4 plants. You will learn more from four healthy plants than from six stressed ones, and you stay well inside any local complaint threshold. If you are a registered medical patient with a documented high monthly need, grow to your medical allowance and keep your registry documentation current. If two or more adults share a house in a per-person state, confirm the household cap before you plan the garden, since that is the number that usually limits you. If you rent, or if your city bans outdoor cultivation, plan for a legal indoor or greenhouse setup instead of testing the outdoor rule.
How to Confirm Your Number Before You Plant
- Read your state cannabis statute or the state cannabis agency page for home cultivation.
- Check your county and city code for cultivation, zoning, and nuisance rules.
- Confirm whether the state counts per person, per household, or per residence.
- Check your lease, HOA agreement, or mortgage terms.
- Note the security, visibility, and distance requirements that come with the count.
- Write down the number you land on and keep it with your grow records.
Plant counts are a moving target. State legislatures and agencies revise home grow rules most years, and local ordinances change faster than that. Confirm your number in the season you plant, not from a guide written two years earlier.