Male cannabis plants look just like female cannabis plants when they are young. But as they enter sexual maturity the differences become obvious. The photo below is of a mature male cannabis plant. It is vital that you remove the male plants from your female plants as soon as the males begin to shed pollen, or you’ll end up with poor quality, seedy bud. Cannabis flowers are wind pollinated, and the male cannabis plant produces abundant pollen. Be kind to your neighbors, and their female cannabis plants! I’ve heard that cannabis pollen can travel up to a mile if the winds are brisk. If you want to do some selective pollination of your female plants – you can! This is covered in The Cannabis Gardener, p. 96.
Penny Barthel 