The only Organic Coco Coir Mix and complete growing medium on the market. WONDER SOIL'S Expand and Plant Organic Coco Coir Mix includes worm castings, humate, organic fertilizer, kelp, and mycorrhizae. It is pathogen free and promotes better aeration and stronger root systems. The 11 lb. Organic Coco Coir Mix cube expands in minutes to 2-1/2 cu. ft. when hydrated. It can be used in any gardening application. Guaranteed low salts.