SuperMoss Orchid Potting Mix is a custom blend of natural Douglas-fir tree bark, organic moss & river sand. We designed this blend specifically to the needs of wholesale orchid growers in California. Its pH makes it an ideal potting medium for orchids. It allows for great oxygenation and drainage of water so that the orchid's roots have constant access to both water and oxygen. This mimics an orchid's natural environment and helps them grow to their full potential.