National Arboretum in Washington, D.C. consists of 446 acres.
Activities are concerned primarily with educating the public and
conducting research on trees and
shrubs. Research on woody plants
emphasizes the development of superior forms that will grow in various
climatic zones in the United States. A herbarium containing 500,000
dried plants is maintained for technical reference.
The Arboretum was established by an act of Congress on March 4, 1927. In
1973, the National Arboretum was placed on the The National Register of
The plantings are arranged in different
combinations throughout the Arboretum. Nine miles of paved roads provide
access to the principal plant groups. There are single-genus groupings
of hollies (Ilex), crabapples
daylilies (Hemerocallis), peonies
(Rhododendron) and maple (Acer).
Plant groups of unusual interest include the
azalea plantings, which are among the most extensive in the Nation;
aquatic plants; the National Bonsai Collection; the collection of
oriental plants in the Cryptomeria Valley of the Garden Club of America;
the Gotelli Dwarf Conifer Collection, the
dogwood plantings of the
Woman's National Farm and Garden Association; Fern Valley, sponsored by
the National Capital Area Federation of Garden Clubs and other
organizations; and the National Herb Garden, sponsored by The Herb
Society of America. The National Bonsai Collection, a bicentennial gift
from the Japanese people, is housed in a specially constructed pavilion.