Black Worm Castings have many beneficial microbes that are important in growing healthier plants, improving soil texture and water-retaining capacity, provide water soluble nutrients to the plants and aid in disease suppression. Pure Black Casting retain up to 300 times their weight in water. Studies show that Pure Black Worm Castings improves plant growth by 20% and increases root mass by 150% (when adding 1 part casting to 9 parts soil). With a diet that’s consistently regulated and replicated, these castings are some of the cleanest products in the world. Contains Mycorrhizae, humic acids and natural wetting agents.