In states that permit recreational home cultivation, the number of cannabis plants you can legally grow typically falls between 2 and 12 per adult, and 6 plants per adult is by far the most common cap. How many weed plants you can legally grow depends entirely on your state, whether you qualify as a medical patient, and in some places whether the plants are mature or still in a seedling or vegetative stage. About 20 states allow some form of personal home growing; the rest, including several that have legalized recreational use, do not.
Mature Plants Are Often Counted Separately
A “6 plant” limit does not always mean six plants of any kind. Many states split the cap between mature (flowering) plants and immature (vegetative or seedling) plants. A state that advertises six plants might actually allow three mature and three immature, or six at any stage, or an unlimited number of seedlings alongside a strict cap on mature and vegetative plants.
This matters because mature plants produce consumable cannabis, and going over the mature-plant portion of the cap can trigger penalties even when your total plant count looks compliant on paper. Read your state’s rule for the breakdown, not just the headline number.
Household Limits When More Than One Adult Lives There
Household caps generally double the individual limit. A home where two adults qualify can usually grow up to 12 plants total if each adult is entitled to 6. A handful of states set a lower household ceiling or hold the cap flat regardless of how many adults live under the roof, so a second grower in the house adds nothing to the limit. The per-residence rule, not the per-person rule, controls when the two conflict.
Medical Patients Often Get Higher Limits
Registered medical cannabis patients frequently receive more generous plant allowances than recreational growers. Some states permit 12 or more plants for medical use, and a few tie the number to documented medical need instead of a fixed cap. Medical cultivation usually requires separate registration through the state’s program. Skipping that registration turns what would be a lawful medical grow into an unregistered one, which is treated as an ordinary violation.
Some Legal States Still Ban Home Growing
Legalizing recreational cannabis does not automatically legalize growing it. As of mid-2025, four states that allow adult-use cannabis still prohibit personal home cultivation entirely. In those states, growing a single plant is illegal regardless of your age or how little cannabis you possess. Medical patients may have separate cultivation rights in some of them, but recreational users do not. People who move between legal states are the ones who get caught by this.
Rules That Apply Even When Your Plant Count Is Legal
Staying under the plant cap is the starting line, not the finish. States layer other requirements on top.
Locked and Out of Sight
The most common rule is that plants must be grown in an enclosed, locked space inaccessible to anyone under 21 (or under 18 for medical). A locked room, closet, greenhouse, or fenced area with a lock typically qualifies. Many states also require that plants not be visible to the public without binoculars or similar aids, which effectively rules out front-yard gardens and open balconies.1Network for Public Health Law. Regulation of Home Cultivation in Adult-Use States Odor control may be required in multi-unit buildings, and some jurisdictions keep cultivation away from schools, parks, and daycare centers.
Landlords and Federally Assisted Housing
Property owners can ban cultivation on their premises even where the state allows it. If you rent, your lease controls, and a prohibition in it overrides your state right to grow. Federally assisted housing is stricter still: cannabis use and cultivation are prohibited in any property receiving HUD funding, because federal law continues to treat cannabis as illegal.2U.S. Department of Housing and Urban Development. Use of Marijuana in Multifamily Assisted Properties Residents of HUD-assisted housing can face eviction for cultivation regardless of state law.
How Much You Can Keep After Harvest
Six healthy plants can produce a lot of dried flower. Several states cap the total weight of harvested cannabis you may keep on hand from your home grow, separate from the plant count. Exceeding that possession limit carries its own penalties, and if your harvest outruns what you can lawfully possess, the excess has to go.
Penalties for Growing Over the Limit
Growing more plants than your state allows shifts the activity from legal personal use into illegal cultivation, and the penalties scale with the overage. A few extra plants may push a civil infraction into misdemeanor territory. A larger overage, particularly one that looks like it could supply more than one household, can be charged as a felony. State law doesn’t ask whether you intended to sell: if the scale of the operation looks commercial, it gets treated as commercial, and commercial cultivation without a state license is prosecuted as an unlicensed business, with felony charges, fines, and asset seizure on the table.
Federal penalties sit on top of all of this and don’t carve out an exception for state-legal activity. Cultivating fewer than 50 plants carries up to 5 years in federal prison and a fine of up to $250,000. Growing 100 or more plants triggers a 5-year mandatory minimum, and 1,000 or more plants carries a 10-year mandatory minimum with a possible life sentence. Repeat offenders face substantially higher minimums at every tier. Federal prosecution of small home growers who follow state law is rare, but the authority to prosecute has never gone away, because cannabis remains a Schedule I controlled substance and cultivation violates 21 U.S.C. ยง 841.3Office of the Law Revision Counsel. United States Code Title 21 Section 841
Collateral Consequences You Won’t See in the Plant-Count Statute
Compliance with your state’s plant limit does not neutralize every risk.
Firearms
Federal law bars anyone who is an “unlawful user of or addicted to any controlled substance” from possessing firearms or ammunition.4Office of the Law Revision Counsel. United States Code Title 18 Section 922 Because cannabis is still federally illegal, every cannabis user falls within that definition, even in fully legal states. The Department of Justice has argued to the Supreme Court that the prohibition should stand even if cannabis is rescheduled. Lying about cannabis use on the federal firearms purchase form (ATF Form 4473) is a separate felony.
Homeowner and Renter Insurance
Many homeowner and renter policies contain exclusions for property used to cultivate controlled substances. If a fire, flood, or other covered loss happens while cannabis plants are present, your insurer may deny the claim under that exclusion, and some policies apply the exclusion regardless of state-law legality. Reading the policy before you plant is cheaper than finding out after a loss.
The practical bottom line: count carefully, know whether your state separates mature from immature plants, respect any household cap, and stay well inside the limit. The difference between six plants and eight can be the difference between a legal hobby and a criminal charge.