Adults 21+ in Oakland County may cultivate up to 12 marihuana plants per household for personal use under Michigan MCL 333.27955, provided plants are not visible from public places and are kept in an enclosed area equipped with locks. Municipalities cannot ban personal home cultivation but can adopt reasonable regulations.
The Michigan Regulation and Taxation of Marihuana Act (MRTMA), MCL 333.27951 et seq., legalized recreational marijuana statewide in December 2018 and is the controlling law for every household in Oakland County. Per MCL 333.27955(1), an adult 21+ may cultivate up to 12 plants for personal use and possess up to 10 ounces of marihuana at home (in excess of 2.5 oz must be in a locked container or area per MCL 333.27954(i)). Plants must not be visible from any public place without binoculars/aircraft, and must be in an enclosed area with locks or other functioning security devices (MCL 333.27954(f)). This applies across every Oakland County city and township — Royal Oak, Troy, Farmington Hills, Pontiac, Birmingham, etc. The 12-plant limit is per residence, not per adult. Outdoor grows in fenced backyards are permitted only if the plants are not visible from the street or neighboring properties; Michigan winters make most Oakland County home grows indoor. Medical caregivers under MCL 333.26424 may grow up to 12 plants per registered patient (max 5 patients = 60 plants plus 12 of their own) in an 'enclosed, locked facility.'
Exceeding 12 plants or making plants visible from a public place is a civil infraction under MCL 333.27965 — first violation fine up to $100 plus forfeiture; second offense up to $500. More than 24 plants becomes a misdemeanor. Excess plants/marihuana not in locked storage may also support a state nuisance action.
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