I am doing 9 right now, but after this grow I am adding 11 more once I get another light. Right now doing 20, i wouldn't have enough wattage even though I have plenty of space. So a 8-9 vote from me. You guys growing 1 - 2 plants, do you buy clones or use femmed seeds? I would pissed growing one plant, and then you start flowering it and it turns out to be a male.
personally i got 10 non-fem seeds germinated the lot. 9 actually germinated. i only really wanted three maximum; i only got 3/9 females. i got silly and decided that two plants is better than three if i was to get caught so i killed the smalles least vigerous plant. ended up with two.
12 clones, 6 vegging, 2 flowerings, 20 total right now, but that will likely change once I get my perpetual going correctly. Then I will probably have 27-36 going all the time... it will all depend on the veg. time I decide on.
Got 5 white widows on the grow right now not feminized so if i end up having 2 would be great (1 is ok too) xD