Greens Mix is a blend of 90% USGA Greens Sand and 10% ERTH Food® Compost. This mix meets USGA physical specifications for greens mix as tested by A2LA Labs. Replacing peat with ERTH Food® in greens mixes provides the following benefits: microbial population; higher organic matter using less product (by weight) than peat; and increased air, water, and nutrient movement within the soil profile.