Is this really so? I've recently started my first grow from seed and think it would be great not to force flowering/revert, or worse yet, having to clone from those and force them just to determine sex. Thanks.:smokin:If you are a seedling grower who does not clone, or a grower who has no seperate vegetative and flowering grow spaces, the easiest method is simply to wait for the preflowers (primordia), and sexual maturity to appear while the seedling is still in vegetative growth. In other words, if you wait until they are 6 to 8 weeks old, most plants will show you their gender without any forcing.
I don't really think it has any negative affect on output. If you are simply taking a few cuttings off each undetermined sex plant, it will not do any real damage or trauma that will effect the overall yield. Plus this way you start flowering clones right away while the other plant is still vegging, if clone turns out female, great you got some nugs to harvest if not its male and you know to pull the plant that is no good.This could have nasty affects on output. I would say veg as long as you can and some strains will actually show sex with out going into the flowering process totally. Use and eye loupe to help with the identification part. pistols will poke out. Some you can get away with doing this others...not so much. You can use any old jewl loupe.
30X Magnifying Loupe | Hydroponics