Westland Bonsai Potting Mix contains unique Seramis granules for optimum water and nutrient availabilityFor strong roots & healthy treesSpecialist blendOpen structured compost for healthy root growthContains water-retaining SeramisWestland Bonsai Potting Mix is formulated to give the correct balance of drainage, water retention and aeration required to develop a healthy root system, which is essential for healthy bonsai growth.