RTi Mykos Bar 3.5 oz. Mykos Mycorrhizal Inoculant - Pure, Fresh, Alive. Contains the following species of vesicular arbuscular mycorrhizal fungi: 80 spores per cc of Glomus intraradices. Mycorrhizae live on the roots of plants and form a symbiotic relationship.  They extend microscopic straw-like filaments called “hyphae” into the soil where they extract, transport, and dramatically increase a host plant’s supply of nutrients and moisture. Use 1 tbls per transplant or sprinkler under the roots. This 3.5 oz packet will treat 6 plants. Ship wt .5#