Depends on how big you want them to get, really. Here's a couple of pics. The first pic is three Indica-dominant plants (White Rhinos on the sides, AK-48 in the middle) that were vegged for around 10 weeks (had to leave town, didn't want to flower until I got back). The fact that the ScroG screen went basically unused in the first pic is because of that long veg time -- the plants just exploded when they went into flowering and I had to fight them all the way through flowering. That pic was taken pretty late in flowering, day 45 or 50 I'd guess.

The second pic is a Sativa-dominant plant (Durban Poison x Skunk #1) that was vegged for six MONTHS (but most of that time in a 1/2 gallon pot, which limited its growth), and the pic is after 9 days of flowering (which means that plant will grow at least another foot or two, maybe more, maybe a lot more). The cabinet in the first pic is 20 inches deep, 47 inches wide, 6 feet tall.

Your closet would fit two plants like those in the first pic, but might not handle even one plant like the one in the second pic.
jamstigator Reviewed by jamstigator on . How Many Plants Should I grow!!! I have a 3 or 4'x21/2'x5' area that I am going to use a 400W HPS. I was woundering how many plants I should grow to get the most out of my light and plants. I dont wana take away any lighting from plants by crowding the area. What do you think will be the proper number. Peace, Sensisaint Rating: 5