Each time you crack an egg open, instead of tossing the shell into the trash, drop it into an open container that you keep in the fridge. I’ve always saved my shells, but my friend Susan suggested keeping them in the fridge; it works beautifully. The cold air in the refrigerator helps to dry them out. As the shells fill the container, I simply push down on them to crush them and make more room. Once the container is at capacity, here’s how you can use those eggshells in the garden.
Deter Slugs and Snails
Crush the shells into small bits, roughly 1/8″ in size. This is an excellent job for kids. Just give them a rolling pin or wooden spoon and let them go to town. Sprinkle these crushed shells around the base of your plants. The sharp eggshells will deter slugs, snails, and other soft-bodied bugs from nibbling on your garden
Eggshells to Improve Soil
Eggshells add calcium to the soil. Calcium is especially appreciated by tomato plants. Add a small scoop of crushed shells directly to individual planting holes when you’re planting your garden.
Adding eggshells to your compost will boost its mineral content. The eggshells break down relatively quickly, but don’t hesitate to use the compost in your garden if the shells are still intact.
Create Worm Housing
I add “stacks” of eggshells to my worm composter pretty regularly and I’ve noticed that in time, these become chock full of worms. Now, I don’t speak worm, so I’m not entirely sure what they’re doing in there, but the shells must provide them with some sort of habitat they need.
Supplement Chicken Feed
This is kind of a roundabout way to use eggshells in the garden, but they’ll get there eventually. I feed crushed eggshells back to my hens instead of buying oyster shells to supplement. They add calcium to their diet and it has never caused my hens to peck at their eggs. It just makes sense. And those eggshells will make their way to your garden in the form of chicken manure.