Soil blend is 100% pure earthworm castings in a concentrated formulation. Soil blend, when mixed at a ratio of 1:3 (1-part soil blend with 3 parts growing medium of choice) will increase growth rates and shorten germination time by up to 50%. You will also enjoy significantly increased yields, and larger more colorful fruits and vegetables. When used on flowers, you can expect more blooms with improved color and quality as well as bloom size. Soil blend will also feed your plants for up to 4 months. Soil Blend Earthworm Castings 10-lb Organic Compost | SBB10