Crushed egg shells add valuable calcium to soil. Calcium is essential for cell growth in all plants. Calcium is especially important for fast growing plants because they quickly deplete the surrounding soil of calcium. Egg shells should be washed before you place them in a compose or into your garden.
Make sure you crush the egg shells before you add them to your garden. Egg shells that are not crushed will break down very slowly.
Besides Calcium, they contain no other nutrients and you will still need to add nitrogen, Potassium and potash to the plant to make it grow properly.
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