If you want a more concentrated dose of calcium, you can put boiled eggshells in a saucepan with water and boil them for a while. other time . This process will further reduce the shell into a finer powder. Once the powder is ready, it can be added to the plant soil. With your new fertilizer , plants will become lusher and pests will stay away . Considering the cost of fertilizers suitable for various types of plants and all pesticides, boiling eggshells is undoubtedly a remedy that will save you money.