Grind Out Slugs
Another reportedly helpful technique for discouraging slugs from feeding in your garden is to spread coffee grounds on the soil surface. Place a thick layer of grounds around the base of plants, especially lettuce and young plants with tender leaves, which are slug favorites.
Like eggshells, the coffee grounds help to enrich the soil and can be mixed into the dirt when you turn over your garden beds at the end of the season. While the smell of coffee may wake you right up in the morning and prepare you for the day, slugs are not big fans.