Kempf Compressed Coco Fiber Growing Potting Mix 10-Pound Block, Medium 100% Natural Eco-Friendly Potting mix Can also be used for worm beds Expands to 17 gallons of Mix, high water retention Repels bugs and mildew resistant Good for soil reconstruction and structure Natural Potting mix Can also be used for worm beds Expands to 17 gallons of Mix, high water retention Repels bugs and mildew resistant Good for soil reconstruction and structure