yup its not possibleI'm new to this myself, but am still fairly confident that you cannot change a male plant into a female plant. We'd all be doing it, otherwise. Any pics? There are some instructions in the FAQ on how to determine the plants sex, which may or may not be of any help. Good luck with those plants!
ok so for some reason you were just being a smart ass rather then helping the guy out.yup its not possible
I am almost positive that @ 3ft tall they have been showing pre-flowers.your at to early of a stage to for them to start showing their sex
opps right you are, i guess i over looked the height depending on your enviroment it should be showing preflower, but it may be strand dependent. If you have a late bloomer them you wont see then @ 3 weeks where as if you had and 8 weeker you would see flowers now, or the late stages of preflower.I am almost positive that @ 3ft tall they have been showing pre-flowers.