Caledonian Tree Co. Ltd a specialist horticulture company that make a market leading product called Air-Pot, used for the planting at the London Olympic Park, Kew and around the world. The unique design of Air-Pot containers has evolved since 1990, constantly improving to guarantee that plants only develop healthy fibrous roots, with no circling. Healthy roots mean faster growth and better uptake of nutrient and water. Made from recycled HDPE, the containers are sturdily built and reusable many times, even in tropical sunshine.