keep shells in open container in fridge. When full, crush shells into small bits and sprinkle around base of plants. Sharp eggshells will deter slugs, snails, and other bugs from nibbling on garden and add touch of calcium to soil.
Going to try this- Amazing Organic Weed Killer Spray. gallon of Apple Cider Vinegar c table salt tsp Dawn liquid dish soap Mix and pour into a spray bottle Spray weeds thoroughly. It makes gallon and worked better than Round Up