DOWN TO EARTH Soluble Root Growth Enhancer. 5 pound package. Colonies of beneficial fungus to help break down the soils organic compounds into a soluble from of nutrients and guard against undesirable microbial colonization.A super fine blend of endomycorrhizae, ectomycorrhizae and humic acid that can be watered into existing plants, seed beds, propagation trays or soils. Can be mixed into potting soils to increase nutrient delivery and expand root production for all plants. Application Rate: Use two tablespoon per gallon of water, once or twice a month during active root growth in Spring, Summer, and Fall.