I prefer not to use chemical slug pellets as I believe that they poison the food chain, so I have been using wool pellets and I cannot recommend them highly enough. I have some hostas in my garden, which are usually a slugs' and snails' banquet, but surrounded by wool pellets the slugs and snails have kept off them. There is something in sheep's wool that is a major irritant to slugs and snails so they won't cross the pellets.