Answer: Believe it or not, marigolds are like bait to slugs! You've just served up a wonderful meal to resident snails and slugs, as evidenced by the slimy trails being left behind. You can make traps to hide under your marigolds - just use old yogurt or cottage cheese containers, sink them into the ground about 2/3 of the way, put about two inches of beer in them, and cover them with a large, flat rock that's been propped up by three or four stones. Leave just enough room between the soil and the bottomof the rock for slugs to crawl under. They'll be attracted to the beer, crawl into the container and drown. The flat rocks will disguise the traps and keep children and animals out of the traps.
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