There is no national number. In US states that allow home cultivation, outdoor cannabis plant limits are set by state law, and cities or counties can set lower caps. Most legal states allow 4 to 12 plants per adult or per household. A few states, including Washington, do not allow recreational home grows.
how many weed plants can i grow at home
Federal law sets the baseline
Cannabis remains a Schedule I controlled substance under federal law. That means any outdoor grow carries federal risk even when it complies with state rules. Federal prosecutors have not targeted small home grows in legal states, but federal law does not authorize cultivation.
State outdoor plant limits: common ranges
Counts below are examples for adult-use home grows. Medical programs often allow more plants or different canopy limits. Verify current rules with your state regulator before planting.
- California: 6 plants per private residence. Outdoor plants must be in a locked space and not visible from public view.
- Colorado: 6 plants per adult 21 and older, with no more than 3 mature flowering plants, and a 12-plant household cap.
- Oregon: 4 plants per residence.
- Michigan: 12 plants per household.
- Vermont: 6 plants per adult, with no more than 2 mature flowering, and a 12-plant household cap.
- Maine: 6 mature flowering plants per adult, with a 12-mature-plant cap per residence.
- Washington: no recreational home grow.
Per-person vs per-household caps
Read the statute's counting unit. California and Oregon cap plants per residence. Colorado and Vermont cap per adult but add a household total. Michigan caps the household. If two adults live together, do not double a per-residence cap.
how many weed plants can i grow at home
Medical versus adult-use grows
Medical cannabis patients often face different plant counts, possession limits, and registry requirements. A recommendation or state medical card may raise your plant count, but local zoning and landlord rules still apply.
Local ordinances can lower your limit
Cities and counties may ban outdoor grows, require fencing or screening, limit canopy square footage, or cap plant counts below the state number. Check both the state statute and the municipal code for the property address.
How to confirm your outdoor plant limit
- Find your state cannabis regulator's home cultivation page.
- Identify whether you are growing as an adult-use consumer or a registered medical patient.
- Search your city and county code for cannabis cultivation, fencing, and odor rules.
- Confirm whether the plant cap applies per person, per residence, or per household.
- Count mature and immature plants separately if your state uses maturity tiers.
- Keep a written plant count and any medical registration on hand for inspection.
Common mistakes
- Adding per-person caps together when the law sets a per-residence limit.
- Ignoring city rules that prohibit outdoor plants entirely.
- Confusing mature flowering plant counts with total plant counts.
- Assuming a state-legal grow protects you from federal enforcement.
Bottom line
Plan for 4 to 12 outdoor plants in most legal states, then confirm the exact count, household cap, and local rules before you germinate. The state regulator and your city code are the controlling sources.