Regional Gardens: The United States National Arboretum

Text by Elaine Mills, Certified Master Gardener
Photos by Elaine Mills & Bob Kline

Arboretum Sign

Arboretum Sign
Photo © 2017 Elaine Mills

The United States National Arboretum, established in 1927 by an Act of Congress, defines its function as “a living museum where trees, shrubs, and herbaceous plants are cultivated for scientific and educational purposes.”

The scientific mission is led by a team of geneticists, plant curators, horticulturalists, and plant pathologists working in the U.S. Department of Agriculture’s Agricultural Research Service. These scientists conduct basic and developmental research to preserve the genetic diversity of landscape plants, and develop new cultivars and technologies for the florist and nursery industries.

Various overlooks from high points in the Arboretum provide panoramic views of the city.

Various overlooks from high points in the Arboretum provide panoramic views of the city.
Photo © 2017 Elaine Mills

Opportunities for educational enrichment include maintenance of the Arboretum’s grounds, as well as tours, exhibits, symposia, and classes. Examples are tours through the azalea collection, lectures on lawn care, the popular full moon hike, and the annual Lahr Symposium on native plants, now in its thirty-first year.

The grounds of the Arboretum are spread over 446 acres in Washington, DC, and are organized into a variety of collections and gardens. These are connected by 9.5 miles of roadways and paths.

Highlights of the Arboretum’s Collections

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Asian Collections

These collections comprise thirteen acres of sloping landscapes, featuring plants native to China, Japan, and Korea, including camellias, witch hazels, apricots, and pines.

Azalea Collection

This popular attraction draws crowds from mid-April to early-May to view thousands of colorful shrubs and to explore the woodland trails.

Boxwood Collection and Perennial Collections

Boxwoods of 150 species and cultivars border one of the roadways. The Perennial Collections of daffodils, peonies, and daylilies are interspersed among the boxwoods.

Conifer Collection

The Conifer Collection occupies five acres on a hillside, and shows off dwarf and slow-growing conifers, as well as crapemyrtle trees bred at the Arboretum.

Dogwood Collection

A destination between April and early-June, the Dogwood Collection includes the native Cornus florida and other members of the Cornaceae family in a peaceful setting overlooking the Anacostia River.

Fern Valley Native Plant Collection

This extensive collection features a wide variety of ferns, grasses, wildflowers, shrubs, and trees that have grown in the Mid-Atlantic region since European colonization. They are planted in naturalistic settings to reflect the geography of meadows, the Piedmont, and the coastal plain.

Holly and Magnolia Collections

The plants in this collection hold our interest through the seasons, from the blooming magnolias native to the southern U.S. in early spring to the brilliant holly berries in winter.

Special Arboretum Gardens

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Aquatic and Container Garden

A variety of aquatic plants are normally on display in the pools surrounding the administration building. These have been removed temporarily while the pools are being renovated.

Friendship Garden

This garden, which surrounds the Arbor House gift shop, was designed by landscape architects Oehme and van Sweden to demonstrate low-maintenance sustainable landscaping techniques.

Herb Garden

The largest designed herb garden in the United States is comprised of multiple themed gardens, a knot garden, and a rose arbor. The plantings include eight hundred species of annuals, perennials, and woody specimens grown for culinary, fragrance, medicinal, and other uses.

Youth Garden

This organic vegetable garden offers hands-on horticultural experience to urban youngsters in grades three to five, applicable to special classroom lessons and activities.

Other Arboretum Features

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National Bonsai and Penjing Museum

The museum includes three pavilions and meditative gardens. Read more about the collections and planned activities for National Bonsai Day.

National Capitol Columns

Standing in a spacious open meadow and accessible from the Flowering Tree Walk, the twenty-two sandstone Corinthian columns, quarried near Aquia Creek in Virginia, were originally installed on the east portico of the U.S. Capitol.

National Grove of State Trees

State trees of most of the fifty states and the District of Columbia grace thirty acres of the Arboretum. Each tree was acquired from the state it represents. The trees of Alaska, Arizona, Florida, Hawaii, and South Carolina cannot be grown successfully at this site, and suitable substitutes were chosen.

Visiting the Arboretum

Arboretum staff suggest visitors allow half an hour to tour each section of the grounds and special seasonal plant features. Visitors can count on spending many enjoyable hours at the National Arboretum throughout the year.

The U. S. National Arboretum
3501 New York Avenue, NE
Washington, DC 20002

The Arboretum is open every day except Christmas from 8 a.m. to 5:00 p.m. Admission is free. After 2 p.m. on weekdays, the R Street entrance is closed, so please enter through the New York Aveunue entrance.


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