Save egg shells! Egg shells can be used to richen garden soil. Rinse egg shells and let dry. Egg shells can be ground into powder or simply broken up into pieces. I use a coffee grounder, but it can be crushed into pieces with a spoon. Whole shells may be used but, it is best to break up the shells to allow them to break down into the soil quickly. Then add the beneficial ingredient to plant soil. The shells release minerals and calcium into the fertile ground. Egg shell powder can be added to compost or garden soil. Just save egg shells from the kitchen, to be ready to use for the garden.