United States National Arboretum was established in 1927 by an Act of Congress. The Arboretum is administered by the U.S. Department of Agriculture’s Agricultural Research Service. It enhances the economic, environmental, and aesthetic value of ornamental and landscape plants through long-term, multi-disciplinary research, conservation of genetic resources, and interpretative gardens and exhibits. Size 446 acres with 9.5 miles of winding roadways. Single‑genus groupings include: azalea, boxwood, daffodil, daylily, dogwood, holly, magnolia, and maple. Major garden features include: aquatic plants, the Asian Collections, the Fern Valley Native Plant Collections, the Flowering Tree Collection, the Flowering Tree Walk, the Friendship Garden, the Gotelli Dwarf and Slow‑Growing Conifer Collection, the Introduction Garden, the National Bonsai & Penjing Museum, the National Capitol Columns, the National Grove of State Trees, and the National Herb Garden.
parks and recreationMaryland, United StatesWashington D.C., Maryland, United States