Organic soil mimics what you would find if you were to dig around in your backyard. That magic topsoil layer that contains decomposing leaves and other material is what creates that rich, nutrient dense soil plants love. For that reason, organic soil products often are enhanced with ingredients such as earthworm castings, and humic matter. Organic potting mix breaks down slowly, and those nutrients are available for the plant to use when it needs it. This creates a complete ecosystem in a container, allowing you to do less but gain more. Certified organic soils have the logo of the Organic Materials Review Institute (OMRI) on the bag, ensuring that the product contains natural materials that have not been around herbicides, fertilizers, or pesticides.