Egg shells, without decomposing for a long time, do not bring the expected benefits.
The use of eggshells is possible for other purposes, for example, to improve the structure of the soil, especially when planting seedlings, creating a barrier for some pests. Finely crushed shells serve as food for soil worms, increasing the fertility of the soil.
Powdered shells applied to the soil attract earthworms, improving soil structure and fertility. Large parts of the shell can help in the fight against mole crickets, as well as protect against snails and wireworms that cannot tolerate the sharp edges of the material.
As a mulch, under which large shells are scattered, this helps protect against pests.
Thus, eggshells, although not a fertilizer in the traditional sense, have their uses in gardening, providing protection and improvement to the soil.
