The USNA was established for scientific research and education, and to display plants which 'conserve and enhance the environment'. The character is woodland and there a number of gardens with different designs. The oldest collection in the arboretum is on Azalea Hill. In the center of the arboretum is a composition of sandstone columns (from the old east portico of the Capitol) by Russell Page (a British garden designer and author of a popular book on The Education of a Gardener). There is also a garden of ferns and prarie plants by Wolfgang Oehme and James van Sweden (authors of a book on Gardening with Nature). The Dwarf Conifer Garden was the work of William Gotelli.
United States National Arboretum, 3501 New York Avenue, NE, Washington, District of Columbia, USA, DC 20002-1958
All year. Daily except Christmas. Open 8am to 5pm.