12 to 15 undereach should be fine with a 4 week veg. The ones that are showing some yellowing may be getting over watered if they are behind and you are feeding them as often as the more healthyer girls. Give them a little more time to dry out between waterings to let them catch up and dry off their wet feet IMO. An extra week or two of veg may help with filling out the canapy to take advantage of all that light.
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BlueBear Reviewed by BlueBear on . How many plants per 1000 watt lamp? I bought 55 clones for this run, looks as if about 8 of them won't make it leaving me with 45-47 depending how a few bounce back. I feel like that's too few. I'm growing Sour Deisel and Grape Ape - both sativas. I am running 3600 watts, and I'm a bit worried about the # of clones I have. I did some LST'ing...that should fill out my canopy a bit more right? I vegged for about three weeks already, they are around 12 inches tall... and will be left in three gallons for another week Rating: 5