how long?

lagboatlenny

once youve started 12/12 how long entil you should be able to sex the plant.
mine have been at 12/12 for 5 days and no sighns yet.

knottyd

Could take up to 2 weeks but usually about 7-10 days but I mostly use fem seeds and see pre-flowers when vegging so I know before hand.

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scott06

kailiwela44

depends how long you veg also. Mine was veg for more than a few weeks, and showed sex about three weeks into 12/12. Isn't the suspense greatfully agonizing?

kailiwela44

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Baywatch242000

Is it not better to take a clipping of your vegging plant, and flower the clipping to determine sex rather than flowering everything? At least you'd know which vegging plants to destroy rather than risk fertilizing a good mother plant?

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scott06

It is a helpful thing to do if you are looking for a mother and don't have one yet. If you are using seeds or going to try a new strain your next grow its fine to flower everything and see who is male and female

also

you could take the cuttings and cross label them from the mature plants....grow out the mature plants (which will flower faster and heavier than the cutting) and then use the appropriat cuttings as moms or your next flowering plants

that is how I would probably do it..

I mostly always start from seeds for three reasons

I don't want a constant grow - My hyper-vigelance goes away if I am not growing all the time -
I like to try different strains
Fresh from seed with time inbetween grows lessens the chance of spider mites and other icky things (like winter does for outside annuals)