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Keep a sharp eye on the taller ones! You can get more females from regular seed if they don't lack for nitrogen and water and also if they aren't exposed to much red light. The third and fourth week of veg seem to be critical. There are a few other factors but those are the ones I remember without searching. I've done regs in hydro before and got about a 4:1 female to male ratio. I'm doing them in coco now so I'll have to see how it shakes out.
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