Next time you crack open your eggs, do not be so quick to throw them away! Eggs are so rich with vitamins and calcium, that is contained in the shell. By simply crushing or grinding up these shells, and adding them to your vegetable garden, it will provide many nutrients that may be lacking in your soil. Add to compost. My personal favorite 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.
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Especially when planting tomatoes, eggshells can really help your plants, to provide nutrients. There is in fact a specific tomato ailment (blossom end rot) that can be cured by supplementing the soil with calcium AKA eggshells.
Adding eggshells to your garden and compost is a common all natural way to add key nutrients to the soil. This is a page about save egg shells for planting tomatoes.
Some gardeners have good success reducing the slug population in their garden using broken egg shells. This is a page about use egg shells for slug prevention.
The calcium in crushed egg shells can be beneficial to your indoor pet birds and even the chickens themselves. This is a page about eggshells for birds.