I agree with stinky on this one guys, I have seen no scientific proof beyond anecdotal posts on forums saying to use birth control pills or using piss from a pregnant horse or from a pregnant woman.

There is no Science behind this that I am aware of, if you have a scientific report that I would read and study. But until then I would take caution. Sex is not determined in the seed DNA but rather in the RNA so that means that the true sex of the plant is not determined until between the third and forth week of true veg. That is why environment is so important at that time of the cycle of life of this plant.
Zandor Reviewed by Zandor on . Treatment of seeds w ethylene gas = more females?? Hey Guys Check this out. I saw this info while surfing the web a while ago. I copied and pasted to my MS Word. Sorry i dont have the source for you guys..what do you think of these methods???? Treatment of seeds with ethylene gas will increase the resulting number of female plants by about 50%. Ethylene is produced by certain plants (i.e., bananas, cucumbers and melons), and these can be used to treat hempseed in a simple manner. About two weeks before you plan to sprout the seeds, Rating: 5