Premier, Pro Mix HP, 3.8 CUFT, Compressed Bale With Mycorrhizae, High Perlite Content, Provides A Great Growing Environment To Growers Looking For A Significant Drainage Capacity, Increased Air Porosity & Lower Water Retention, Added Benefit Of Fibrous Peat Moss & Coarse Perlite Makes This Formulation Ideal For Growers Who Require A Product Adapted To Their Needs For Watering Flexibility & Crop Seasonality.