And fem seeds do not mean female plants. You have a much higher chance of getting a female but it is not one hundred percent up to genetics. In fact, many say it is equal parts environment and genetics that determine male or female. You need to watch your nitrogen, your temps, And anything that will stress it out after its second week of vegetation. That's why you're not purpose to trim, FIM, or top during weeks 3 and 4 of Veg before flower. Fem seeds are created by forcing a female in flower to go Hermi, generally stress or silver compounds. Their seeds can carry that herm gene, and just as easily turn male. Google it... Or review the forums.