Established in 1927 by an Act of Congress. The Arboretum is administered by the U.S. Department of Agriculture’s Agricultural Research Service. It was created to serve the public need for scientific research, education, and gardens that conserve and showcase plants to enhance the environment. Its size is 446 acres with 9.5 miles of winding roadways.
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Its gardens gardens includes: azalea, boxwood, daffodil, daylily, dogwood, holly, magnolia, maple, and peony. 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.