Growing Cannabis for Personal Use: US Home Grow Laws
Home grow laws by state: plant limits, age rules, federal status, and where growing cannabis for personal use is still illegal in the US.
If you buy cannabis from a licensed retailer or a delivery service, the household plant limit in your state does not change what you can purchase. It only changes how much you may grow at home. The core buying advice is this: treat plant limits and purchase limits as two separate laws. Before you spend money on seeds, clones, a tent, or lights, confirm three numbers for your address: the state cap, the medical versus adult-use cap if both exist, and the local city or county cap. Local rules routinely set a smaller number than the state maximum, and the smaller number is the one that applies to you.
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Plant limit versus purchase limit
A plant limit counts living cannabis plants on the property. A purchase limit counts the flower, concentrates, or edibles you can buy in one transaction or possess at one time. These numbers move independently. A state can allow a generous retail purchase limit while banning home cultivation altogether, and a state can allow a home grow while capping dispensary transactions. If your goal is a steady supply, buy from licensed sellers and treat any home grow as a supplement, not a replacement.
What to check before you rely on any number
- Per person or per household. Some states count plants per adult. Others count per address. Two adults in one home do not always get double the plants.
- Plant stage. Many states count mature, flowering plants differently from immature plants and seedlings. A cap of six mature plants may come with a larger allowance for young ones.
- Medical status. Registered patients often get a higher cap than adult-use consumers, and sometimes a lower one for household totals.
- Local ordinance. Cities and counties can ban outdoor grows, require locked enclosures, or lower the plant count.
- Landlord and lease terms. A lease can prohibit cultivation even where state law allows it.
- Visibility rules. Most states require plants to be out of public view, which affects balcony and yard grows.
Common limit bands by state
- Four plants per household: Oregon uses a per-residence cap rather than a per-person cap, so adding adults to the household does not raise it.
- Six plants per residence: California allows adults 21 and older to grow up to six plants at a private residence, and local governments may permit more.
- Six mature plants per household: Maine separates mature, immature, and seedling counts, so the raw plant total can look higher than the flowering cap.
- Twelve plants per household: Colorado, Massachusetts, and Michigan all use a household ceiling for adult-use grows, with medical programs often set higher. Massachusetts caps the household at 12 no matter how many adults live there.
- No adult-use home grow: Washington and Illinois do not permit recreational cultivation, though medical patients in those states may qualify for a limited grow.
Pitfalls that catch buyers
- Multiplying a per-person cap by the number of adults in the home when the state applies a household cap.
- Assuming the state maximum overrides a stricter city or county rule. It does not.
- Buying clones or plants across a state line. Federal law still prohibits moving cannabis between states, plants included.
- Forgetting flowering-stage limits, which can force you to harvest or destroy plants before you hit the total count.
- Confusing a home grow with delivery. A delivery order limit is set by purchase rules, not plant rules.
- Relying on an old blog number. Legislatures adjust these caps, and medical programs change more often than adult-use programs.
FAQ
Does a household plant limit affect what I can order online?
No. Retail purchase and possession limits are separate statutes. Check your state's transaction cap and the delivery rules for your city.
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Can two adults in one house each grow the full personal limit?
Sometimes, but not always. Where a household cap exists, it applies to the address, so the two adults share one pool of plants.
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Do medical patients get more plants?
Frequently yes. Colorado and Maine both give registered patients a higher allowance than adult-use consumers, and some states allow cultivation only for patients.
Where should I confirm my limit?
Start with your state cannabis regulator, then check your city or county code. Confirm before you buy equipment, because limits can change between legislative sessions.