I don't know why female plants that are stressed develop male flowers. Maybe the plants feels threatened by the stress and needs to reproduce to protect it's genes from dying out??? With the female plants from feminized seeds that develop male flowers from stress. The plant is not changing sex really. It is still genetically a female. I actually did some research on the seeds and sex of the plants. I have found conflicting information on whether the sex is predetermined which I have read on before, or if it is decided sometime during the plants growth. I also read about treating seeds with hormone to produce more females. So now I don't really know for sure. I am confused.