This rich, loamy mix is a premium choice for all-purpose gardening applications. Our 100% organic base consists of screened earthworm castings, Canadian sphagnum peat moss, compost and forest humus. We blend in compost, forest humus and a specifically formulated organic fertilizer to increase the organic content. Perlite and pumice are added to ensure optimum aeration for sturdy growth. Listed by the Organic Materials Review Institute (OMRI) for organic production.