Premier PRO-MIX® BX Mycorrhizae - 2.8cu ft Loose Fill BagInstore Location: @A General purpose peat based professional growing medium designed for general greenhouse use and transplanting applications. Perlite and vermiculite provide a balance of moisture and nutrient retention along with good drainage creating an ideal growing environment. with mycorrhizae added. 80% Canadian sphagnum peat moss. 15% perlite. 5% vermiculite. Mycorrhizae glomus intraradices, for enhanced nutrient and water uptake, stress