For some reason from everything I have read, these big places like Nirvana, and I am sure there are a few other seed suppliers that are all probably feminized for the most part. What I mean is they are all feminized to an extent, but there is another line that is more-so feminized. It would not suprise me a bit that any purchase from the bigger suppliers would normally produce probably 75% females at the minimum of their "cheaper" line. Then if you wanted feminized seeds of the same strain they are more than likely to have another lot of plants producing that same line, which would probably give you a 95% ratio on female plants. I just dont see how anyone can guarantee 100% female in each seed, growing these plants makes us GODS over whether or not they live or die, but there is nothing that I have found that can make us be the ultimate GOD of these plants. There are a few things that nothing we do that controls the sex of the plant. That would ultimately mean the death of a strain if there was not a male to keep it going. Its life, it always takes two different genders to keep life going. Nature always finds a way......