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Pro-Mix® HP Mycorrhizae™ is a high-porosity, peat-based growing medium. This formula ensures optimum growth, especially when high air capacity and extra drainage are required. It is ideal for water-sensitive crops, root cuttings and/or low-light growing conditions. Pro-Mix® HP Mycorrhizae™ is compatible with a wide variety of ornamental plant species, fruit crops and most vegetable transplants. Contains Canadian sphagnum peat moss (65–75%/volume), horticultural-grade perlite, dolomitic and calcitic limestone (pH adjuster), wetting agent and mycorrhizae – endomycorrhizal fungi (glomus intraradices).