Sunshine Advanced Mix #4 is meticulously formulated to retain moisture while improving root aeration. It is used by professional growers, yet is also perfect for beginners. This mix ensures a strong, healthy root system that has better resistance to stress because of its organic ingredients. Advanced Mix #4 contains Canadian Sphagnum peat moss, coarse perlite, coconut coir & an organic starter nutrient charge. This mix is also complemented with multiple strains mycorhizzae & an organic wetting agent. It is perfect for various horticultural potting applications. Compressed 3 cubic ft/bag.