Pokon Bonsai Growing Medium, 5LPokon Bonsai Mix Pokon Bonsai Mix is suitable for all bonsai trees. The soil contains only the best quality raw materials, such as peat litter, clay, volcanic pumice and lime. This ensures a fine structured soil and a firm base for slow but steady and balanced growth of your bonsai in a pot or bowl. The soil also contains enough plant food for approximately 60 days. Instructions: Sprinkle a layer (20 25%) of hydro granules into the pot Fill the pot