Eggs are a staple in many households, but the shells are often tossed without a second thought. What many people don’t realize is that eggshells hold practical value, especially in the garden. Rich in calcium and trace minerals, they can support healthier soil and complement other natural methods used around the home. Instead of viewing them as waste, more and more gardeners consider shells a small but useful resource.
In the garden, crushed eggshells are commonly used as a gentle, natural deterrent for soft-bodied pests like slugs and snails. Their rough texture may discourage these creatures from crossing treated areas, helping to protect vulnerable plants. Some people also sterilize and crush eggshells to offer birds an occasional calcium boost, especially during nesting season. For gardeners who work with plants that thrive with added calcium — such as tomatoes, peppers, or squash — mixing broken shells into the soil can help over time as they slowly decompose.
Eggshells can also play a role in balancing soil health. In areas with naturally acidic soil, crushed shells may gradually reduce acidity as they break down, creating a more neutral environment for certain plants. Because this shift is slow, many gardeners pair eggshell use with standard soil-care practices like mulching, aerating, and composting. In fact, adding shells to a compost bin is a popular option — they contribute valuable minerals while reducing kitchen waste.
Repurposing eggshells is a simple, eco-friendly practice that benefits your garden and reduces what goes into the bin. Whether you’re improving your compost, nurturing backyard birds, or helping protect tender plants, this small habit can make your outdoor space healthier and more sustainable. Sometimes the most helpful tools are the ones we’ve been throwing away.