The Air-Pot® container design guarantees healthy root development by allowing for additional oxygen in the growing medium, leading to healthy bacteria and better release of nutrients to the plant. The shape of the walls eliminates root circling and encourages the development of a mass of healthy fibrous roots. Constructed from tough recycled plastic, Air-Pot containers can last 10 years or more. Accommodating plants 8 feet or taller, the #15 Air-Pot is ideal for growing larger plants, shrubs and trees for at least two years. This pot measures 17.1 inches in height and 16.5 inches in diameter, and can be used indoors as long as space allows. The #15 pot holds 12 gallons and when transplanted, the plant will not suffer transplant shock.