Premier Tech Pro-Mix HP Biofungicide + MycorrhizaePro Mix HP Biofungicide + Mycorrhizae is a high porosity, peat based growing medium ideal for water sensitive crops, root cutting and or low light growing conditions. Pro Mix HP Biofungicide + Mycorrhizae is suitable for a wide variety of horticultural plants, especially when high air capacity and extra drainage are required. Features high perlite, peat based growing medium with high drainage capacity. Designed for water sensitive crops. Ideal for low