Eggshells, don’t throw them away: soak them in hot water and see what happens

In fact, many gardeners place eggshells in hot water because this helps remove residual proteins and fats from the surface, making them easier to grind and use as fertilizer.

In addition, the hot water can also help kill any bacteria or fungi on the eggshells, making them safer to use as fertilizer.

Since eggshells are rich in calcium and other minerals important for plant growth, placing them in hot water dissolves the calcium in the shells and makes it available to plants.