I think slugs and things may like it to sleep under.
mountaingirl

Now there is Permaculture in action, the problem is the solution - use the stuff to trap slugs away from your plants. They'll even eat some of it, hopefully leaving your veg alone. Even if some critter then eats the slug, the poison will have diluted down, and its likely to be a one-off, whereas if you put it on your garden, you will be eating it regularly (recycled through the plants) and it can accumulat in your system.