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How to use Egg shells as fertilizer

Eggshells can be a great source of calcium and other minerals for your plants, and they can also help to deter pests such as slugs and snails. Here's how to use eggshells as fertilizer:
Collect your eggshells: Start by saving your eggshells after cooking or baking. Rinse them out and let them dry.
Crush the eggshells: Once the eggshells are dry, crush them into small pieces. You can do this by using a mortar and pestle, a rolling pin, or by placing them in a plastic bag and crushing them with a spoon or the bottom of a cup.
Add the crushed eggshells to your soil: Sprinkle the crushed eggshells onto the soil around your plants. You can also mix the crushed eggshells into the soil before planting.
Water the soil: Water the soil after adding the eggshells to help the nutrients in the shells break down and become available to the plants.