Copper kills slugs where as salt only dehydrates them, but they continue to live....Penny Ball for the garden. Pennies in the garden repel slugs and make hydrangeas blue. I love this idea. It looks old and new and beautiful.
These copper bands are one of the best, non-harmful slug repellants around. Slugs and snails hate copper because it causes a harmless electric shock-like reaction when they come into contact with it, so they crawl away. Bend them into rings and push them into the soil at the base of your plant.