The topsoil 50/50 Mix is 50% screened soil and 50% compost. The screened soil is a sandy loam topsoil screened to 1/4 in. minus. The compost is made from decomposed vegetation and equestrian shavings. The compost is fully cooked for a minimum of 90 days. This material is used for sod or seed preparation for depths between 1 to 6 inches. This mix is also one of our most popular and can be used a a general planting mix. Great for planting trees and shrubs.