Gray Garden Slug is a common slug found in gardens. They have a protective slime that allows not to dry up or move across the ground. They are omnivorous and eat plants and animals, they are considered pests in gardens because they eat lettuce and other vegetables. But if you find slugs in a flower garden they are helpful creatures, they reduce crowding in the garden by eating the plants, the safest way to remove slugs is Soap, because they can not stick the plants. Salt is a enemy to slugs and worms and will dry them out but if you put salt on your plants it will dry out the plants too.