If you didnt know, plants dont show sex until YOU MAKE THEM. Once you make do that they will quit growing up and then grow buds or pollen sacks. Do you know about manipulating the seasons indoors? If not, wait till it gets as tall as you want it and then switch its light to 12 hours of light and 12 hours of dark. When its night time it has to be pitch black around it. Until then you wont know.