Eggshells aren’t waste—they’re a powerful, eco-friendly tool for your home and garden. Crushed shells deter pests like slugs and even deer, while attracting birds that need calcium. In soil, they act as a natural fertilizer, strengthen plants, prevent issues like blossom-end rot, and help balance pH. Added to compost, they enrich it further—turning a simple kitchen leftover into a key part of a healthier, more sustainable garden.