It depends on what county you live in... 49 plants per person in Northern Cali (san fran, oakland, etc) with a script. and 5 plants per person in southern cali (LA county, san deigo, etc) with a script. Also in Humboldt county one can grow as many plants as they like, limited to 100 square feet total canopy per patient. Meaning a 1,000 member co-op can have 100,000 square feet of marijuana plants, no numbers limit. I think Santa Cruz has way better rules but i have to ask a friend.
B ; )