The Larz Anderson Bonsai Collection at the Arnold Arboretum in Jamaica Plain, Massachusetts is one of the premier collections of bonsai in the United States and includes a Hinoki Cypress over 250 years old. The Bonsai Pavilion where the trees are housed are part of the complex of buildings known as the Dana Greenhouses. The collection is on display from mid-April to the end of October. As the bonsai trees are deciduous, they are held in cold storage at temperatures slightly above freezing throughout the winter.