The first company to produce an effective hormone treatment was Hybritech, with a product called eliteXelite. However, this product is no longer available for public purchase. PG-Solutions has a hormone spray called Stamen-It! The pollen must be applied to a true female to get female seeds. Not a plant which you have seen pistilate growth. It is paramount that a true female be used for breeding. Tricking mother nature by making female seeds is not easy, and requires some research into breeding.