Composting turns kitchen scraps, paper and garden clippings into organic material for the garden. Make a do-it-yourself compost heap by using a frame of wooden posts surrounded by chicken wire fencing. Attach the wire fencing with twist ties. Composting works best when one-third of the material used is brown matter such as shredded paper or dry leaves; one-third green material such as lawn clippings; and one-third kitchen scraps such as eggshells. Eggshells add calcium to the compost.
Place eggs shells in a plastic bag with a zip closure. Crush the eggshells by pressing on them with your hands while they are inside the bag. Place the bag in the freezer until you have several dozen to compost.
Let the bag stand outside the freezer for 30 minutes to defrost.
Sprinkle the shells evenly over the compost heap.
Cover with a layer of brown matter, green matter, a handful of nitrogen-based fertilizer and a 1-inch layer of garden soil. Continue until the compost bin is full.
Turn the materials with a shovel every few weeks.
Spread the compost over the garden when it's brown and crumbly and you can't see chunks of the original material. This will usually take eight to 12 weeks.