Premier Horticulture Pro-Mix HP PRO-MIX 'HP' is a "High Porosity" peat/perlite-based growing medium. This mix ensures optimum growth, especially when high air-capacity and extra drainage are required. It is ideal for water-sensitive crops, rooting cuttings and/or low-light growing conditions. MYCORISEŽ PRO ensures stronger, healthier plants due to more root systems and better fertilizer uptake. Check with your supplier for pricing in your area. Note: Due to our distribution agreement with Premier Horticulture we are not able to sell their products from the Oregon border south to Modesto, California. Sold individually. Canadian Sphagnum Peat Moss (70-75%/vol.). Endomycorrhize (MycoriseŽ PRO). Extra Perlite - horticultural coarse grade. Dolomitic & Calcitic Limestone (pH adjuster). Macronutrients. Micronutrients. Wetting agent.