servo,
thanks for the reference. I googled the snail and found an article in Annals of Applied Biology that showed 1 to 2 % caffeine solution completely toxic to all snails in their study. The plant used was orchid and no toxicity of the orchid found.
Nick

I just used snail bait on top of the sphagnum moss mine are in. While the bit seems to mold up and get fuzzy and colored, I just spray with fungicide and it kills the problem, but the natural stuff I got has iron in it and it doesn't hurt the plants. Those snails are awful though, and will devour anything they can put their sticky slimy foot on- I have even had them infest my orchids and clean out new healthy roots and even the small shoots coming off pseudobulbs- so kill them all and check the medium for more cuz in my experience, if the medium is moist they will multiply in it like crazy and take down a good sized plant in no time.