Purple Cow Classic Compost is a time tested, and proven way to add beneficial microbes, Carbon and balanced nutrients to your soil. Classic Compost improves soil structure and porosity, creating a better plant root environment. It allows plants to more effectively utilize nutrients, while reducing nutrient loss by leaching and enables soils to retain nutrients longer. Also containing humus, Classic assists in soil aggregation and makes nutrients more available for the plant. This 100% plant-based and organic product is OMRI Listed for organic production.