Mycorrhizal fungi are essential to plant growth, but they're often not present in urban settings, especially when soils are moved, compacted, have fertilizer and pH imbalances, or are low in organic matter. Also, commercial potting mixes and fumigated soils are often sterile - with no mycorrhizal fungi at all! Get mycorrhizal fungi transplant inoculants in convenient, pre-measured 3 oz tree survival paks or bulk pails, with live spores of beneficial endo and ectomychorrhizal fungi ... plus Terra-Sorb (water absorbent gel) and biostimulants to ensure the survival of your transplants. Use on all trees and shrubs - 3 ounce pack will treat one caliper tree or three 2 gallon potted shrubs. 30 - 3 ounce packs per bag.