Recommended by Andre Viette, Rock Phosphate is a natural rock mined from phosphorus-rich deposits. The rock is washed free from clay impurities and heated to remove moisture. It is then mechanically ground to a fine powder. EspomaÆ Rock Phosphate is the finest, highest grade, all natural rock phosphate available. It is far superior in total phosphate content to all other natural forms of rock phosphate including black and colloidal rock phosphate.
Benefits of Rock Phosphate:
Organic source of phosphorus & micronutrients
Long term, slow-release feeding as the plant needs it