PRO-MIX BX BIOFUNGICIDE + MYCORRHIZAE is a general-purpose, peat-based professional growing medium suitable for a wide variety of horticultural plants and transplanting applications. This medium provides the protection of a high-quality biofungicide and the growth-enhancing qualities of 100% contaminant-free Premier Tech mycorrhizae. The biofungicide is Bacillus pumilis, bacteria that colonize developing root systems to suppress disease-causing organisms that attack roots, such as pythium, fusarium and rhizoctonia. The bacteria also act as a biostimulant that develops with the roots to establish a vigorous root system, resulting in more uniform plant stands after transplantation and greater crop yields. 3.8 cu ft of compressed PRO-MIX equals about 7 cu ft in use.