During the winter months, distribute your shells over the plot of land where you will
plant come springtime. Once the ground warms up, you can till the shells into the soil.
If you have problems with slugs and snails in your garden, try sprinkling coarsely-crumbled eggshells around the plants where these slimy little pests like to dine. The shells’ sharp edges deter snails and slugs by abrading the sensitive foot of any land mollusc that attempts to cross the barrier. Most snails and slugs will quickly emigrate from your garden in search of easier pickings.