Black Kow composted cow manure is made from the finest raw materials available… manure from dairy farms. The all-natural organic way to improve native soils is by using Black Kow composted cow manure. By mixing Black Kow cow manure with your native soil before planting, you do 3 important things: Provide moisture holding capacity to sandy soils, Provide aeration and moisture holding capacity to hard, clay-type soils and Give your plant’s roots the optimum environment in which to get started.