ORCHID"NUTS" Premium Orchid Potting Mix - Medium, 3 Pounds One 3 pound bag of orchid potting media. Proprietary mix of pine bark, clay aggregate and volcanic ash rock, among other top grade media. Clean and ready to use straight from the bag. Medium size media that ranges range from 3/8" to 1/2" is perfect for any orchid of popular orchid genera such as Cattleyas, Dendrobiums, Cymbidiums, Catasetums, Oncidiums, etc. 3 pounds of mix will approximately fill three 6" Round Plastic Orchid Pot, or three 5" Round Plastic Orchid Pot, or six 4" Round/Square Plastic Orchid Pot, or fifteen 3" Round Plastic Orchid Pot, or ten 3-1/4" Square Plastic Orchid Pot, or twenty 2-1/4" Square Plastic Orchid Pot