there are a few way's to feminize seed's you can use asprin or gibberilic acid sprayed on the flower's or you can disturb the night cycle when there in flower with turning on a light on 2-3 time's a night .this should produce one or two male pollen sack on a manly female plant ,you then take that pollen and fertilize a seperate female plant with the pollen and the resulting seed's will be mostly female.