Eggshells can be an excellent source of calcium and other minerals for your plants, and they can also help deter pests like snails and slugs. Here’s how you can use eggshells as fertilizer:

1. Collect your eggshells: Start by saving your eggshells after cooking or baking. Rinse them and let them dry.
2. Crush the eggshells: Once the eggshells are dry, crush them into small pieces. You can do this 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 glass.
3. Add crushed eggshells to your soil: Sprinkle crushed eggshells over the soil around your plants. You can also mix the crushed husks into the soil before planting.
4. Water the soil: Water the soil after adding the eggshells to help the nutrients in the shells break down and become available to plants.