Unless your seeds are feminized, each seed has exactly a 50% chance to be female. However, this does not guarantee 50% females (as you found out), you could have more or less based on chance.

There are environmental factors that can cause the plants to turn from female to male (but not the other way around), such as an irregular light cycle or temperature stress. I think there are others, but I don't know.

Peace
smoknjoe Reviewed by smoknjoe on . male to female ratio ive just determined the sex on the five plants thats i was growing and four of them are male and one is a hermie...pissed off...does any1 have a reason for this was it some thing i did wrong or is it just one of those things that happen some times..... Rating: 5