Sheet composting, also known as lasagna composting or sheet mulching, is a method of cold composting that involves layering carbon-rich and nitrogen-rich materials directly on the soil. It is useful for improving soil quality, converting lawn to garden beds, and expanding garden space. The process is simple, involving alternating layers of materials like leaves, manure, and newspaper until the pile reaches 18 inches to 3 feet tall. It may take 6 months or longer to fully decompose before planting, as there is no heat generated. Sheet composting is a low-cost and easy way to improve soil structure and recycle organic materials.