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Quote: Yrat said: i've always read that plants become sexually mature when the leaves become alternate instead of opposite. i believe this is around the 4-6 week mark when preflowers begin to show. i always assumed that this change in morphology was a direct sign of sexual maturity... i mean, there has to be some reason for it, right?
you are correct, sir. Alternating phyllotaxy is a sign of sexual maturation. By the time you see your nodes becoming uneven you should be seeing your preflowers pretty soon.
Personally i always wait when im starting from seed to sex my plants. A lot of people seem to take clippings from their unsexed plants and then throw the "moms" into flower to determine their sex. I agree with hanky in that it's not really a good thing. Biologically speaking you're forcing a plant into a phase of growth it's not entirely ready for.