Sun Bulb Better-Gro Special Orchid Mix is a multiple use potting mix for growing Phalaenopsis, Cattleyas, Dendrobiums, Oncidiums, Paphiopedilums, and all other epiphytic orchids. The distinct versatility of this mix, ensures it is the obvious choice for small orchid collections, orchid hobbyists, or the professional grower. Better-Gro Special Orchid Mix is an effective combo of sponge rock, western fir bark, and hardwood charcoal that has been precisely created by a group of vastly trained orchid growers. Gives orchids the air flow, root ventilation and drainage that they would thrive on and find a natural environment. To support healthy growth, this product should be used as needed or every 12-18 months at least and when re-potting orchids. Resealable bag contains detailed guided instructions with photos.