Using Eggshells In Your GardenNext time you crack open your eggs, do not be so quick to throw them away! Grind or crush them up and add to your vegetable garden, it will provide many nutrients that may be lacking in your soil. Add to compost. Use in the garden is to deter slugs, snails, and cutworms. They stay away, leaving you with uneaten flowers, plants, and vegetables. Just sprinkle around your planting areas.