I germinated some bag seeds and was was thinking i would take a cutting and flower it to check the sex of the plant. So i was wondering how early i would be able to do this? Is it possible to flower at any time?

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wait at least a month to take clones or flower...

it's possible to flower at any time, yes, but unless you are doing a scrog, it is not worth it. let your plant veg out for a few weeks first...

you can tie a black baggie over a branch during veg to mimic the flowering cycle... just make sure that branch gets 12 hours of darkness inside it's little baggie and it should show sex.

wouldn't that strain the plant, if part of it is in flowering and the other is in veg?
And wouldn't the sealed of part require any air circulation?

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if your plant is healthy enough to take a cutting from its healthy enough to sex. The cutting will only be good for sexing it not for actually flowering, so once you find out its a girl toss the cutting and crack open a beer and celebrate!