Pro-Mix¨ BX Mycorrhizae is a general purpose peat-based growing medium containing, a beneficial mycorrhizal inoculum (Glomus intraradices). These microscopic fungi attach to and colonize the root systems working in symbiosis with plants. Contains: Canadian Sphagnum peat moss (75-85%/volume), PerliteÑhorticultural grade, Vermiculite Ð horticultural grade, Dolomitic and Calcitic limestone (pH adjuster), Wetting Agent and Mycorrhizae Ð endomycorrhizal fungi (Glomus intraradices).