Someone posted that water used to wash rice worked well in attracting earwigs. Copper strips, slug traps, and big bands of wood ash or cedar sawdust around seedlings also work. Slugs will get an electric shock when their bodies touch the copper, and they cannot cross the barriers. This is a powder you can buy at plant stores which contains the dried crystals of diatoms, which are sea organisms. When dead and dried into crystals, they are so sharp that they actually cut the soft bodies of slugs that crawl over them if you sprinkle the powder in the garden.
Slugs eventually die of the wounds.
You will have to sprinkle at least once a month, more if it rains. It will attract and kill slugs quickly. They seem to head for less dangerous pastures. The two caveats to this method are, wear thick gloves when handling the Holly, and don't put it in an area where kids will be. The slugs disintegrate quickly.