After munching on Easter eggs, don’t toss the shells; recycle them. Sprinkle crunched up eggshells around plants to deter snails and slugs. Finely-crushed eggshells can also be added to birdseed to provide a calcium-rich supplement for our feathered friends. Before stirring the shells into the seed, spread crushed shells on a foil-lined baking sheet and bake at 350 degrees F. for 10 minutes to sterilize them.
Source — Green Circle Growers