All you do is cover a single branch with something like a garbage bag, make sure no light can reach the covered and taped branch. The branch will begin to show its sex, but the rest of the plant continues in vegetative state. Usually takes a week or so. so No BS!
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Not saying that won’t work I just can’t speak from experience...I still look for the V hairs.
But if that works that’s super cool to know...science!!!