"Grow Your Own" state cannabis laws

California
Grow Limits: Adults over the age of 21 may cultivate up to six (6) plants per residency. Medical marijuana patients and their primary caregivers may cultivate up to six (6) mature cannabis plants, or up to twelve (12) immature cannabis plants. With the recommendation of a physician, medical marijuana patients may be permitted to grow a greater amount per the patient’s needs.

Colorado
Grow Limits: Any adult resident of Colorado may grow up to six (6) plants per person, with no more than three (3) plants in the mature/flowering stage at any time. Non-Colorado residents may not cultivate cannabis. No more than twelve (12) total plants are allowed per residence regardless of the number of adults living there. Cannabis plants must be kept in an enclosed, locked area out of view. Homegrown cannabis may not be sold to others.

Hawaii
Grow Limits: A registered medical marijuana program participant that indicates their intent to grow on their application may grow an “adequate supply,” or no more than seven (7) plants total and no more than 4 oz. of usable marijuana jointly between a registered patient and caregiver. A qualifying patient may designate a caregiver on their application to grow no more than seven (7) plants total on their behalf. A caregiver may only grow for one patient at a time. Whosoever is designated to grow medical marijuana should tag each plant at the base with their 329 card number and expiration date. Act 241 eliminates the ability of a caregiver to grow medical marijuana on behalf of a qualifying patient after December 31, 2018 (unless the patient is a minor or adult lacking legal capacity or resides on an island without a dispensary).

Maine
Grow Limits: A maximum of six (6) mature plants per Maine resident may be cultivated for personal use. Anyone who elects to cultivate marijuana plants must keep the plants in an enclosed, locked facility unless the plants are being transported. Minors, incapacitated adults, homeless qualifying patients, and registered patients in hospice or nursing facilities may not cultivate his or her own marijuana. Only designated primary caregivers or designated dispensaries may cultivate on behalf of a qualifying patient in this case.

Massachusetts
Grow Limits: Adults over the age of 21 may cultivate up to six (6) mature plants per person for personal use, and plants must not be visible to the general public. A qualifying medical marijuana patient with a hardship cultivation registration may cultivate a limited number of plants sufficient to maintain a 60-day supply solely for that patient’s use. He or she may apply for a hardship cultivation registration if the patient can demonstrate that his or her access to a registered medical dispensary (RMD) is limited by:

• Verified financial hardship
• Physical incapacity to access reasonable transportation (an inability to use public transportation or drive oneself), lack of personal caregiver with reliable transportation, or lack of RMD that will deliver to the patient’s or personal caregiver’s primary address
• Lack of a RMD within a reasonable distance of the patient’s residence and lack of a RMD that will deliver marijuana to the patient’s or personal caregiver’s primary address

To obtain a hardship cultivation, a registered qualifying patient shall submit:

• A nonrefundable registration fee (unless waived due to financial hardship)
• Information supporting a claim that access is limited to one or more of the above circumstances
• An explanation including lack of feasible alternatives to mitigate limitations claimed
• A description and address of the single location that shall be used for the cultivation of marijuana, which shall either be the registered qualifying patient’s or personal caregiver’s primary residence
• A written explanation of how the qualifying patient will cultivate marijuana
• A description of the device or system that will be used to ensure security and prevent diversion of the marijuana plants being cultivated
• Written acknowledgement of the limitations on his or her authorization to cultivate, possess, and use marijuana for medical purposes

Nevada
Possession/Use and Grow Limits: The holder of a valid registry identification card is prohibited from cultivating, growing, or producing marijuana if a dispensary opens in their county of residence. If the holder of a valid registry identification card resides in a county with no dispensaries, the holder of the card is exempt from state prosecution for:

North Dakota

A primary caregiver cardholder, who has in his or her possession, a registry identification card, shall not be subject to arrest, prosecution, or penalty for assisting a patient cardholder, to whom he or she is connected through the department’s registration process, with the medical use of marijuana; provided that the primary caregiver cardholder possesses an amount of marijuana that does not exceed twelve (12) mature marijuana plants and two and one-half (2.5) ounces of usable marijuana for each patient cardholder to whom he or she is connected through the department’s registration process. If the health care professional determines that the medical needs of the patient exceed those amounts, the health care professional must specify on the authorization that it is recommended that the patient be allowed to grow, in his or her domicile, up to fifteen (15) plants for the personal medical use of the patient, and may possess up to sixteen (16) ounces of usable marijuana in his or her domicile.