I'm no chemical engineer, so I can't give an accurate answer. Also, English not being my native language, I guess my technical approximations could be quite messy. But... I guess the plant must metabolize (as we all living entities do) whatever it eats, so it must transform nicotine into whatever kills or repels aphids. Actually, I've never eaten my roses, so I don't know if they taste horrible or if they are poisonous. One thing I know is that when I have aphids on my Chile plants (and that will be in the future, not having any right now!), I'll water them with the tobacco liquid, and then I'll see. Anyway, I think I'll start some questioning about this to people I think should know. If ever I get some coherent answers, I'll communicate all interested. Gerardo Constance Allen wrote: > Chile Headers, > There must be a difference between nicotina (I thought a poisonous plant) and the tobacco fumigant that > some of you are using. I also thought that I had read about a nicotine spray that was poisonous if it > was still on the leaves or whatever part of the plant one would eat. > But,...anything coming up through the root system, I would think does not wash off and could be harmful > if eaten. > Hey you experts! I just have written a lot of beliefs; do you have the facts to help us out???