I know the active ingredients absorb and stay systemically in the plant. I also know if you spray neem oil early enough, you won't detect it in the end. That is my goal. What are your experiences with neem products for those who have used them multiple times? How fast does it leech out of the plant? I hope I don't have to use it any time past transplanting or a little after. Spraying / applying during flower is not an interest of mine.