Michigan's Regulation and Taxation of Marihuana Act (MRTMA, Initiated Law 1 of 2018) allows adults 21 and older to cultivate up to 12 marijuana plants per household for personal use. Detroit does not impose additional local restrictions on home cultivation beyond the state law.
Under MRTMA, adults 21 and older may grow up to 12 plants in their residence for personal use. Plants must be kept in an enclosed, locked space not visible from a public place. Landlords may prohibit cultivation in rental properties through lease terms. Home cultivators may not sell marijuana; personal use limits apply (up to 10 ounces at home, with amounts over 2.5 ounces secured in a locked container). Detroit has not enacted a local ordinance restricting home cultivation beyond the state framework. Home extraction using volatile solvents like butane is prohibited under state law.
Exceeding 12 plants per household is a civil infraction for the first offense (up to $500 fine) or a misdemeanor for subsequent offenses. Growing in an unlocked or publicly visible area can result in fines. Using volatile solvents for extraction is a felony under Michigan law.
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Side-by-side rule comparisons with other cities in Wayne County.
See how other cities in Wayne County handle home cultivation.
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