PRO-MIX HPCC BIOSTIMULANT + MYCORRHIZAE is a high-performance medium designed for high-porosity conditions that delivers maximum aeration and drainage. This peat-based substrate is made from a balanced blend of coarse peat moss and chunk coir to improve air porosity and maintain optimal moisture retention. It’s made with MYCORRHIZAE (Glomus intraradices), a beneficial endomycorrhizal fungus that enhances root development, nutrient uptake, and overall plant resilience. It also contains an all-natural biostimulant that boosts microbial activity in the root zone — supporting lush, healthy growth throughout the plant’s life cycle. With a low bulk density and superior drainage, it’s a top choice for reducing the risk of overwatering and root disease. For a slightly finer texture with improved water retention, check out PRO-MIX HP BIOSTIMULANT + MYCORRHIZAE — perfect for growers who prefer hand-watering or less frequent irrigation. Want more control over drainage? The PRO-MIX HPO BIOSTIMULANT + MYCORRHIZAE is a peat-based blend without perlite that would be perfect.