Composting is the natural process of decomposing organic materials into a nutrient-rich soil called compost. To make compost, gather kitchen and garden waste and place it in a container with holes for airflow. Layer the materials, keeping the mixture moist but not wet. After 25 days of regular mixing, earthworms will be present and turning the waste into fertilizer. Fully decomposed compost will be ready in 60-70 days to use in gardens.