PRO-MIX BX MYCORRHIZAE from Premier Tech Horticulture is a general purpose, peat-based professional growing media designed for a wide range of greenhouse and transplanting applications. The product contains a mycorrhizal inoculum (Glomus intraradices). These microscopic fungi attach to and colonize the root systems working in symbiosis with plants. This symbiotic relationship between fungi and plant, results in an overall improved plant growth.