Penn Valley Potting Soil combines Aeromaster Humus Compost with years of research to develope a long-lasting potting soil with an optimum combination of minerals and nutrients for health and vitality. Penn Valley Potting Soil adds coconut coir to support better water infiltration, improve moisture management, and increase soil porosity. The added coir and other microbial inoculants increases the biological diversity of the mix. This makes it great for greenhouse operations as well as growing potted plants.