Eggshells are often tossed into the trash without a second thought, yet they can be surprisingly useful in everyday home and garden routines. Because they contain small amounts of minerals—especially calcium—many people choose to repurpose them rather than waste them. With a bit of preparation, eggshells can become a natural, eco-friendly addition to household practices that support sustainability and reduce waste.
In gardening, crushed eggshells are commonly used as a gentle deterrent for certain pests. Their coarse texture may make it uncomfortable for slugs or snails to cross areas where the shells have been sprinkled. Some gardeners also place sterilized, finely crushed eggshells outdoors as an occasional source of calcium for wild birds, especially during nesting season. Additionally, plants that prefer soil with gradual calcium enrichment, such as tomatoes and peppers, can benefit from eggshells worked into the soil over time.
Eggshells can also help improve soil conditions in subtle ways. In naturally acidic areas, crushed shells may slowly reduce acidity as they decompose, supporting plants that grow best in more neutral soil. Because this process takes time, many people pair eggshell use with other soil-care methods, like mulching, aeration, or balanced composting.
Adding eggshells to a compost bin is another simple way to reuse them. As they break down, they contribute minerals and structure to the compost while reducing household waste. Repurposing eggshells may seem small, but it offers an easy, natural way to support your garden, wildlife and overall sustainability efforts at home.