The short answer
There is no national number. Cannabis remains illegal under federal law, so the only plant count that protects you is the one your state wrote into statute. In the states that permit recreational home grow, the cap usually falls between four and twelve plants, and six is the number you run into most often.
Cannabis Growing Laws and Plant Limits in 2025: What You Can Grow at Home
Two details shape that range more than anything else. First, most caps apply to the residence, not the adult, so a house with four roommates does not get four times six plants. Second, medical patients frequently get a higher allowance than recreational users in the same state, sometimes double.
What the limits look like in practice
- California: six plants per private residence, kept in a locked space and out of public view.
- Colorado: six plants per adult, twelve per household, with a separate ceiling on how many can be flowering at once.
- Massachusetts: six per adult, twelve per household.
- New York: six mature and six immature plants per adult, twelve mature per household.
- Michigan: twelve plants per household.
- Oregon: four plants per household.
- Virginia: four plants per household.
- Washington and New Jersey: no recreational home grow at all.
Treat that list as a sketch, not a license. State legislatures adjust plant counts, and a few states have loosened or tightened limits in the last two sessions.
Mature versus immature, and why the distinction bites
A plant count is rarely one number. Many states split it: a set number of mature, flowering plants plus a larger allowance for seedlings and vegetative plants. Colorado and Vermont both work this way. If you clone aggressively and veg for eight weeks, you can blow past the mature cap without ever intending to.
I look at the flowering limit first, because that is the number that actually constrains a harvest schedule. The immature allowance mostly tells you how much you can experiment with.
Per person or per household?
This is the single most common misread. A six-plant-per-adult rule in a two-adult home often comes with a household ceiling of twelve, but not always. Some states apply the cap to the address with no per-adult multiplier at all. Asking "how many can I grow" and "how many can we grow" gives you two different answers.
Why so many caps land on six
Convenience did a lot of work here. When a dispensary is a ten-minute drive and carries a dozen strains, growing stops being a supply strategy and becomes a hobby. Legislatures set modest caps because retail access covered the demand, and because a small plant count is easier to defend politically than a large one.
The pattern shows up in the states with the strongest retail networks, which are often the ones that skipped home grow entirely or held the cap at four. Where dispensaries are scarce or expensive, the cap tends to be more generous, and medical programs pick up the slack.
Rules that override your state cap
- City and county ordinances can be stricter than state law. Los Angeles and Denver both add local conditions.
- A lease can ban cultivation even where the state allows it.
- Federal land, public housing, and most college campuses are off limits regardless of state rules.
- Giving away or selling over your state's limits is a separate offense, and plant count is only part of it.
Confirming your number
- Find your state's statute or the cannabis regulator's own summary, not a blog list.
- Check whether the cap is per person or per address.
- Note the mature and immature split.
- Read your city code and your lease before you germinate anything.
Six is the safe guess for a conversation. It is not a safe guess for a grow room.