Growing weed in Maine is legal for adults 21 and older, who can cultivate up to six mature plants, 12 immature plants, and unlimited seedlings at home for personal use. Registered medical patients can grow the same number of plants but keep far more of the harvest. Both programs come with rules about tagging, visibility, and where the plants can live, and both sit under a federal ban that still carries real consequences for firearms owners, federally-assisted housing tenants, and caregivers who owe federal taxes.
Recreational Limits for Adults 21 and Older
Under Maine’s adult use cannabis law, any person 21 or older can grow up to six mature cannabis plants, 12 immature plants, and an unlimited number of seedlings for personal use.1Maine State Legislature. Maine Revised Statutes Title 28-B 1501 – Personal Adult Use of Cannabis and Cannabis Products Those limits apply per person, not per household, so two adults living together can each grow six mature plants. Selling any of the cannabis you grow at home is prohibited.
Every mature and immature plant must carry a legible tag with your name, your driver’s license or state ID number, and a note that the plant is being grown for personal adult use. If you’re growing on someone else’s property, the tag must also include the property owner’s name.2Maine State Legislature. Maine Revised Statutes Title 28-B 1502 – Home Cultivation of Cannabis for Personal Adult Use
You can keep all of the cannabis your plants produce at your home or at the cultivation location, no matter the weight. The moment you leave that location, though, the standard carry limit applies: 2.5 ounces of cannabis, or a combination of cannabis and concentrate containing no more than 10 grams of concentrate.1Maine State Legislature. Maine Revised Statutes Title 28-B 1501 – Personal Adult Use of Cannabis and Cannabis Products
Medical Patient Rules
Maine’s medical cannabis program allows the same plant count but much larger possession. To grow as a medical patient, you first need a written certification from a medical provider confirming a qualifying debilitating condition. Registering with Maine’s Office of Cannabis Policy for a registry identification card is voluntary and free; the certification itself is what legally protects you.3Maine.gov. 18-691 CMR Chapter 2 – Maine Medical Use of Marijuana Program Rule
A qualifying patient can grow up to six mature plants, 12 immature plants, and unlimited seedlings. That cap applies whether you grow the plants yourself or a caregiver grows them on your behalf. The major difference from the recreational program is possession: medical patients can possess up to eight pounds of harvested cannabis, well above the 2.5-ounce recreational carry limit.4Maine Legislature. Maine Code Title 22 2423-A – Authorized Conduct for the Medical Use of Cannabis
Caregivers
Primary caregivers operate at a larger scale. A caregiver can grow up to 30 mature plants, 60 immature plants, and unlimited seedlings. As an alternative, they can cultivate up to 500 square feet of mature plant canopy and 1,000 square feet of immature plant canopy. You have to pick one measurement method for each growth stage; you can’t count mature plants individually while measuring immature plants by canopy.4Maine Legislature. Maine Code Title 22 2423-A – Authorized Conduct for the Medical Use of Cannabis A caregiver can maintain up to two separate cultivation areas, and the mature and immature areas can sit on different parcels as long as every location is disclosed to the department.
Where the Plants Can Go
Both recreational and medical cultivation must happen on private property. Maine law gives you three options: land where you live, land you own but don’t live on, or someone else’s land with their written permission.2Maine State Legislature. Maine Revised Statutes Title 28-B 1502 – Home Cultivation of Cannabis for Personal Adult Use Renters fall under that third option and need a written agreement from the property owner before starting.
Your plants cannot be visible from any public road or sidewalk without the use of binoculars, aircraft, or other optical aids. You also have to take reasonable steps to prevent anyone under 21 from accessing the plants. A locked room or a fenced outdoor area with restricted access will usually satisfy this.
Medical cultivation is tighter. Plants must be kept in an enclosed, locked facility or area, and outdoor grows require a privacy fence at least six feet high that blocks the view of the plants.5Legal Information Institute. 18-691 C.M.R. ch. 2, 3 – Cultivation of Marijuana for Medical Use
What Towns and Cities Can Do
Local governments in Maine cannot ban home cultivation, and they cannot charge a license or permit fee for it. They can cap the total number of plants allowed on a single parcel, but any local ordinance must still allow at least six mature plants, 12 immature plants, and unlimited seedlings per adult domiciled on the property.2Maine State Legislature. Maine Revised Statutes Title 28-B 1502 – Home Cultivation of Cannabis for Personal Adult Use A town could cap a property at 12 mature plants even if three eligible adults live there, but it can never go below six per person.
What Happens If You Go Over
Any unauthorized cannabis plants or products are subject to forfeiture and seizure. Beyond losing the plants, you face whatever additional criminal or civil penalties apply under Maine’s other laws.6Maine State Legislature. Maine Revised Statutes Title 28-B 1504 – Violations; Penalties Severity scales with how far over the limits you go. A couple of extra plants is treated very differently from a large unlicensed commercial operation, and that gap is where the distinction between a cultivation violation and a drug trafficking charge lives.
Federal Law Still Applies
Everything above is legal under Maine law. Under federal law, it isn’t. Cannabis remains a Schedule I controlled substance, the same category as heroin.7Office of the Law Revision Counsel. 21 USC 812 – Schedules of Controlled Substances As of early 2026, proposed rescheduling to Schedule III has not been finalized. Federal prosecution of small personal grows is rare, but the federal classification creates real problems in a few specific areas.
Firearms
Federal law prohibits any “unlawful user of or addicted to any controlled substance” from possessing firearms or ammunition.8Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Because cannabis is federally controlled, anyone who uses it—including Maine residents growing legally under state law—is a prohibited person under federal firearms law. ATF Form 4473, filled out when buying a firearm from a licensed dealer, asks directly about controlled substance use, and answering falsely is a separate federal felony.
Federally-Assisted Housing
If you live in public housing or receive Section 8 assistance, growing cannabis at home can cost you your housing. Federal rules require housing authorities to remove tenants who use controlled substances on the premises, and that includes state-legal marijuana, medical or recreational. Home cultivation is effectively off the table in federally-assisted housing until federal law changes.
Taxes for Caregivers
Personal growers don’t face tax issues beyond what any gardener would. Registered caregivers do. Under IRC Section 280E, no deductions or credits are allowed for expenses tied to trafficking in Schedule I or II controlled substances.9Office of the Law Revision Counsel. 26 USC 280E – Expenditures in Connection with the Illegal Sale of Drugs Caregivers cannot deduct utilities, rent, supplies, or equipment; only cost of goods sold reduces taxable income. The effective tax rate can be very high, and professional tax advice is worth the money before you scale up.