Rich soil for planting is a type of soil known as LOAM, which is composed of clay, sand, and silt in equal parts. LOAM is considered to be the ideal soil for growing plants because it has the perfect balance of nutrients, water retention, and drainage. It is also rich in organic matter, which helps to provide essential nutrients to the plants. LOAM is often used in gardening and farming, as it provides the best environment for plants to thrive.