Good god, there are already 239,317 threads on this subject. Here's the short version of the oft-repeated answer: female seeds grow female plants. End of story.
hogwash... i have only grown '2' types of fem'd seeds both by rez..
basic kush...9 out of 10 were males, not hermies...full blown males... the 10th was a runt.
and
rez's abusive.. think we have grown 5 of the seeds... all full blown ladies... not a nanner tobe found..
so we are battling .500...
and growing a number of rez's regular beans... and most are very (very) good...we'll stick with reg. seeds...