With spring around the corner, it's a good time to start collecting eggshells for your flowering bushes and gardens. After you've cracked eggs to make frittatas or scrambled eggs, rinse the shells out and place them on a microwave-safe plate. Zap them on high for about three minutes to sterilize and dry them out. The shells will become very dry and will be safe to store. In the spring, crush the shells into a powder and mix them into the soil near flowering bushes like rhododendrons and hydrangea. These plants thrive from the calcium boost from eggshells and will give you stronger and more vibrant blooms all spring and summer long.