No, you cannot legally grow weed in NH. New Hampshire treats cultivating even a single cannabis plant as felony-level manufacturing of a controlled drug under RSA 318-B, with penalties far heavier than those for simple possession. Neighboring Vermont, Maine, and Massachusetts allow personal home grows; New Hampshire does not, and a 2026 legalization bill that would have changed that died in the Senate.
Why Growing Counts as “Manufacturing”
The state’s Controlled Drug Act makes it illegal to manufacture, possess, sell, or transport any controlled drug outside authorized channels, and “manufacture” includes planting, growing, and harvesting.1New Hampshire General Court. New Hampshire Code 318-B:2 – Acts Prohibited No provision of state law authorizes personal cultivation for any purpose.
People often assume that because New Hampshire decriminalized small-amount possession in 2017, growing a plant or two must be a minor offense too. It isn’t. Under RSA 318-B:2-c, adults 18 and older caught with three-quarters of an ounce or less face a $100 civil fine on a first or second offense.2New Hampshire General Court. New Hampshire Code 318-B:2-c – Personal Possession of Marijuana That relief is limited to possession. The moment a seed goes into soil, the conduct is manufacturing, and manufacturing is a felony.
Prison Time and Fines
Cultivation penalties under RSA 318-B:26 scale with the weight of the plant material, not the number of plants. The first-offense tiers are:
- Less than one ounce: up to 3 years in prison and a fine of up to $25,000.
- One ounce or more: up to 7 years in prison and a fine of up to $100,000.
- Five pounds or more: up to 20 years in prison and a fine of up to $300,000.
Repeat offenses roughly double the exposure: up to 6 years and $50,000 for the lowest tier, up to 15 years and $200,000 for the middle, and up to 40 years and $500,000 for the highest.3New Hampshire General Court. New Hampshire Revised Statutes 318-B:26 – Penalties A $350 minimum fine applies to all drug offenses under the chapter.
Weight is calculated with any adulterants or dilutants included, so wet plant material, stems, and other trimmings count toward the total rather than only trimmed dry flower. A few plants in late flowering can easily push a case from the lowest tier into the middle one. If the grow is within a school zone, RSA 651:6 allows extended sentencing, with a felony carrying a potential minimum of up to 10 years and a maximum of up to 30 years.4New Hampshire General Court. New Hampshire Revised Statutes 651:6 – Extended Term of Imprisonment
What Else You Can Lose
Your House, Car, and Equipment
A cultivation arrest opens the door to civil asset forfeiture. Under RSA 318-B:17-b, anything used or intended for use in a felony-level manufacturing violation is subject to forfeiture, and the statute specifically names grow lights alongside vehicles, cash, and real estate.5New Hampshire General Court. New Hampshire Revised Statutes 318-B:17-b – Forfeiture of Items Used in Connection With Drug Offense Property found near controlled substances is presumed forfeitable, and the burden falls on the owner to prove otherwise. The state’s lien attaches from the moment of seizure, and on final forfeiture the state’s title relates back to that date. A home grow can cost you the home itself.
Professional Licenses
A conviction under any section of the Controlled Drug Act triggers automatic notice to your licensing board. RSA 318-B:18 requires the court clerk to send a copy of the judgment and sentence to whichever board or officer issued your professional credential.6Justia. New Hampshire Code 318-B – Controlled Drug Act Nurses, teachers, real estate agents, and other credentialed professionals will have their board informed regardless of self-reporting, and many boards treat felony drug convictions as grounds for suspension or revocation.
Firearms
Federal law prohibits any “unlawful user of or addicted to any controlled substance” from possessing firearms or ammunition.7Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Cannabis remains Schedule I federally, so anyone growing it becomes a prohibited person for gun ownership. Lying about cannabis use on ATF Form 4473 when buying a firearm is a separate federal offense. The restriction applies to medical cannabis patients as well.
Medical Patients Still Can’t Grow at Home
New Hampshire’s Therapeutic Cannabis Program, created under RSA 126-X in 2013, lets qualifying patients purchase cannabis with a registry identification card, but it does not authorize home cultivation.8New Hampshire Department of Health and Human Services. Therapeutic Cannabis The statute defines a “cultivation location” solely as a locked, secured site under the control of an Alternative Treatment Center — not a patient’s home.9New Hampshire General Court. New Hampshire Code 126-X:1 – Definitions All therapeutic cannabis must be purchased from a licensed ATC. A card holder who grows their own plants loses the program’s legal protection and faces the same criminal penalties as anyone else.
Seeds and Grow Equipment
The 2018 Farm Bill defined “hemp” to include any part of the Cannabis sativa L. plant, seeds included, with no more than 0.3 percent delta-9 THC on a dry weight basis.10Office of the Law Revision Counsel. 7 USC 1639o – Definitions Seeds meeting that threshold are not federally controlled. That is not a defense to a New Hampshire cultivation charge. Planting seeds with the intent to grow cannabis that will exceed 0.3 percent THC is manufacturing a controlled substance under RSA 318-B:2, and possessing seeds alongside grow equipment supplies strong evidence of that intent.
Grow lights and hydroponic gear are legal to own in the abstract; garden supply stores sell them openly. Once that equipment is found with cannabis plants, seeds, or other drug evidence, it becomes both a paraphernalia matter and evidence supporting the manufacturing charge. A paraphernalia offense under RSA 318-B:26 is a misdemeanor with a $350 minimum fine and up to one year in jail, and grow lights are specifically listed as forfeitable property.3New Hampshire General Court. New Hampshire Revised Statutes 318-B:26 – Penalties
Industrial Hemp Is a Separate Track
One narrow legal path exists to put cannabis plants in the ground in New Hampshire: an industrial hemp license through the USDA Domestic Hemp Production Program. Because the state runs no program of its own, growers apply directly to USDA through the Hemp eManagement Platform. The license itself has no fee, but applicants must pass an FBI criminal background check, and a controlled substance felony within the past 10 years is disqualifying. Licensed growers must register their sites, report acreage, submit to pre-harvest sampling by a USDA-certified agent, and destroy any crop that tests above 0.3 percent delta-9 THC. This is a commercial agricultural program, not a route to a home marijuana grow.
Where Legalization Stands in 2026
The New Hampshire House passed HB 186 on January 7, 2026, by a 208-135 vote. The bill would have let adults 21 and older possess up to two ounces of cannabis flower and grow up to six plants at home, with no more than three mature at a time. On March 5, 2026, the Senate voted 15-9 to table the bill with a pending “inexpedient to legislate” motion, effectively killing it for the session. It’s the same pattern of recent years: House passage, Senate block.
Until a legalization measure clears both chambers and reaches the governor, growing weed in New Hampshire remains a felony. The decriminalization of small-amount possession can create a false sense of security, but the law draws a hard line between having cannabis and producing it, and the penalties on the production side are among the steepest in the state’s drug code.