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Sex in cannabis is 'set' during the very early seedling stage. You can easily force 99.9%+ female by simply pollinating a 'normal' female with pollen from a female that has, either naturally or through photoperiod manipulation or even chemical treatment, produced male sex parts. These 'nanners', as growers call them, are interesting in that, while they produce pollen that by all appearances is in fact viable pollen, it is physically impossible for it to contain a Y chromosome. Therefore, all offspring will be female.

Google 'feminizing seeds' and you will eventually find an interesting article by the breeder Soma on this subject.
stinkyattic Reviewed by stinkyattic on . Using genetics to determine a plants sex Hi all, this is my first post. I'm actually a scientist. I currently do cancer research but I had been a plant molecular geneticist at one point in my past. I started growing medical cannabis a couple years back and wondered if it would be possible to determine the sex of a plant simply by looking at the genes. In this way you could identify males and females as very small seedlings. Bottom line is I have done it. I use a marker to screen my plants and separate out the males. I developed Rating: 5