Sun Bulb Company Inc 50180 Better Gro 4-Quart Orchid Bark Premium, multi-purpose potting medium for all Phalaenopsis, Cattleyas, Dendrobiums, Cymbidiums, & all Epiphytic Orchids Perfect for potting, re-potting, or spot refilling It is also a great base for creating custom mixes Combination of specifically sized and graded western fir bark. Easy Re-Seal Bag