From The Grow Guide
Sexing Marijuana Plants (telling male from female)
Once your seeds begin to grow into a plant you need to sex the plant. You need to
sex the plant because only the female plants produce the buds you want to smoke. Do
this by putting the plant on a light cycle of 12 hours on 12 hours off. After a week
or two you will begin to see small white hairs emerging from the sacks at the
base of the branches. If you see hairs coming out of the sacks you have a
female. If the sacks develop but no hairs emerge you likely have a male. Unless
you are going to seed out some of your plants you will want to get rid of the
males as soon as possible.
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