Don't really know if it's a scam or not but both plants that did hermie were stressed--they both did start out as females and were from different seeds--one blueberry and one unknown sativa type thing--both exposed to abnormal lighting (I think) and hermied later on the blooming stage. This stuff is apparently supposed to prevent them from going hermie period, no matter what. Can't tell you how it works (or even if it does--suppose the ony way would be if I got hermies from plants that have been sprayed and so far I haven't). The thing that freaks me out so much about growing outdoors is the THOUSANDS of things you can't control. How did folks deal with all those factors in an guerilla type grow?