Westland Bonsai Potting Compost Mix and Enriched with Seramis, 4 Litre Westland Bonsai Potting Mix?is ready to use straight from the bag and is the perfect medium for potting Bonsai trees and is enriched with Seramis. It provides the perfect balance of drainage, moisture retention and aeration so that a Bonsai can develop a healthy root system and?thrive. This Potting Mix includes Seramis granules to help maintain adequate moisture levels and nutrient availability. It also has wood fibres which create open structure to improve aeration, drainage and water management. Westland Bonsai Potting Mix includes all the nutrients needed for the first 6-8 weeks. We recommend feeding your Bonsai in spring and early summer with appropriate feed every 2 weeks. ?