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Eggshells, often discarded, can enhance garden soil by providing calcium and improving soil structure over time. Proper preparation involves cleaning, drying, and crushing them before application. While they are beneficial, they are not a quick fix for soil issues and do not deter slugs effectively. Common myths about their use include misconceptions about their ability to reduce soil acidity and serve as pots for seedlings. Eggshells can be added to compost for additional minerals, but they should not replace mulch. Various types of eggshells can be used, with differences in thickness affecting their preparation.