But do they? I tried last night to find a study I had read last year that, I believe, stated that after testing many plants that had thrown pistils, not one tested as a true male female hermaphrodite but only female pollen producing one, the actual true male/female plant never found. I'm still trying to find it. As I was looking I saw the whole range of theories and falsehoods that this subject is known for. hopefully someday all the theory and conjecture is finally proven or debunked. FYI I'm not saying it does or doesn't happen, still trying to figure it out lol.