I can't find the link (I had just closed it about 30 mins before reading this ) but optimal conditions are right temp, right nutrients etc. Basically don't stress the plant, especially during the 3 and 4 weeks of vegging (which is when the plant 'decides' its sex). I'll have another go looking for the link.Yeah that link would be great. I'll try and find it if you can't locate it. What exactly are optimal conditions??