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Reading Preflowers Before Flip
Sexing happens earlier than most beginners expect, usually a few weeks into veg when preflowers appear at the nodes. Males show small ball shaped sacs on a short stalk, while females push out a pointed calyx with a pair of white hairs. There is a clear photo guide at https://breederregularseeds.com comparing both at several stages, which helped me stop second guessing borderline plants. A cheap jeweller loupe makes the whole process a lot less stressful.
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