Eggshells are a great source of calcium and They also contain other nutrients, such as magnesium, phosphorus, and potassium, Adding eggshells to the soil can help to improve the overall health of your plants and make them more resistant to pests and diseases. and they can be used to fertilize soil in a number of ways. Here are a few methods:

Crushed eggshells

Crushed eggshells can be added directly to the soil around plants. They will help to improve drainage and aeration, and they will also release calcium and other nutrients over time. To crush eggshells, simply rinse them out and then use a mortar and pestle, a rolling pin, or a food processor to break them into small pieces.

Eggshell powder

Eggshell powder can be made by grinding crushed eggshells into a fine powder. This powder can be added to potting mix or sprinkled on the soil around plants. Eggshell powder is a good source of calcium, magnesium, and phosphorus, all of which are important nutrients for plant growth.

Eggshell tea

Eggshell tea can be made by steeping crushed eggshells in water for several days. The resulting liquid can be used to water plants. Eggshell tea is a good source of calcium and other nutrients, and it can help to improve the overall health of plants.