Used coffee grounds + crushed dry egg shells = no blossom end rot
Coffee grounds fit the standards set by gardeners for compost materials. The grounds, when mixed with soil, release nutrients that make the ground richer and more acidic. Plants that flourish in acidic soil will be healthier since they can get the needed nourishment from the ground. If you have a good supply of coffee grounds, just spread them evenly in your garden. Your plants will reward you by producing robust blooms.