The "high quality" of EDAPHOS® Potting Compost was achieved thru reduced usage of normal peat and the greater portion of EDAPHOS® Humus that in this case is the absolute substitute for chemical fertilizers. Very special too is the addition of pearlite (=through heat expanded volcanic stone). Due to this EDAPHOS® Potting Compost achieves a very high water storage capacity and natural ventilation for each potted plant.