Sun Bulb 50000 Better Gro Special Orchid Mix,  4-Quart Multi purpose potting mixture for growing cattleyas, phalaenopsis, dendrobiums, paphiopedilums, oncidiums and all epiphytic orchids Dynamic combination of western fir bark, hardwood charcoal and sponge rock specifically formulated by a team of highly trained orchid growers Promotes healthy, strong growth by providing superior drainage, allowing for proper root ventilation Contains 4 quarts