I've had decent luck treating my collection, which summers outside, to a good soaking of strong, cooled coffee. I've read that the caffeine kills the snails. Last year, I spritzed coffee on a few snails, and they were dead within minutes. After treating the entire collection twice last fall, I was snail-free all winter indoors. After 5 months outside, I have a few snails again this fall. I treated just last night and will treat again in two weeks. Cheap, safe, and it seemed to work.
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