ORCHID"NUTS" Premium Orchid Potting Mix - Large, 2 Pounds One 2 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. Large size media that ranges range from 1/4" to 1" is perfect for larger orchid plants or BS orchids of popular orchid genera such as standard Cattleyas, Laelias, and many more. 2 pounds of mix will approximately fill two 6" Round Plastic Orchid Pot, or two 5" Round Plastic Orchid Pot, or four 4" Round/Square Plastic Orchid Pot.