How to handle this potting up?

I currently have 25 plants vegging in 1 gallon fabric pots... regular non feminized seeds. My plan is to up pot them to 3 gallon fabric in a few weeks and flower in 5 gallon sub irrigated planters. My issue is I want to avoid; if I can, is moving all 25 to 5 gallon SIPs only to have to cull half of them. Then I am making all that soil have to make more SIPs. Should I move them all to flower in the 3 gallon pots until they show sex and then up pot? Will that cause stress issues? Oh also all organic soil grow.

I would leave them where they are till they show pre flowers, should be weeks 4-6...ish. cull your males, up pot only your girls. I've seen quite a few people take their 1 gallon girls to harvest, should have plenty of room at least till pre flower.

Johiem said:

I would leave them where they are till they show pre flowers, should be weeks 4-6...ish. cull your males, up pot only your girls. I've seen quite a few people take their 1 gallon girls to harvest, should have plenty of room at least till pre flower.

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Hmmm but then I would also be ok upping them to 3 gallon pots ans doing the same with the pre flowers... I hate to rely on just pre flowers though. I guess I will really have to brush up on them.