Many gardeners may toss egg shells onto tomato patches, work coffee grounds into rose gardens or use newspapers as mulch. But Harris said composting stabilizes the nutrients so they're more slowly released into the soil. Composting breaks down plant scraps into a soil-like material. Although compost does provide some nutrients, its main value is as a soil amendment. It helps the soil hold water, keep nutrients near plant roots and allow air to move freely around roots.
Some homeowners shy away from making compost, worrying about odors and pests.
Composting relies on natural bacteria to break down material put in the pile. Regular mixing for good aeration, proper moisture and a good blend keeps odor to a minimum. But don't put meat and dairy products onto the heap. They rot and attract flies or small animals. When it's done, it smells very earthy.