Espoma Organic 8 qt. Organic Potting Mix. This all-purpose potting mix is perfect for all potted plants, both indoors and outdoors. Made with a rich, premium blend of sphagnum peat moss, peat humus, and perlite that has been enriched with Myco-tone and fortified with worm castings. This potting mix provides bigger blooms and better drought resistance, making it an ideal choice for all your potting needs.