Archives of American Gardens
The Archives of American Gardens (AAG) is a collection of 100,000 photographic images and records documenting over 6,000 historic and contemporary American gardens including the history of the Smithsonian’s gardens since the inception of the horticulture program in 1972. 

Smithsonian Gardens’s Garden Furnishings and Horticultural Artifacts Collection
SG also maintains a Garden Furnishings and Horticultural Artifacts Collection which includes over 1,700 items.  Many of the antique furnishings date from the Victorian era; scores are displayed throughout the Smithsonian gardens.

Smithsonian Institution Libraries’ Botany and Horticulture Library
The horticulture section of the Botany and Horticulture Branch of the Smithsonian Institution Libraries has over 5,000 books and 2,700 volumes of periodicals.  The collection consists of materials in practical and historical horticulture, garden history, and landscape design in America. 

Smithsonian Institution Gardens
The Smithsonian Gardens has a horticultural staff of 50 and two landscape architects who design and manage the grounds of the Smithsonian museums in Washington, D.C., and develop horticulture displays and exhibitions in exterior and interior museum spaces.

Smithsonian Institution’s National Museum of American History Library
In addition to the thousands of historic horticulture trade catalogs located in the Smithsonian Institution’s National Museum of American History Library, the library supports research in advances in technology, including machinery and transportation, all areas of American history, including social, cultural, political, and economic events and development, the impact of social, cultural, political and economic developments on everyday American life, and scientific developments.

The Washington, D.C., metropolitan area is abundant with other resources that contribute to the study of horticulture and garden history.  The area is dotted with numerous historic gardens such as Mount Vernon, Gunston Hall, Dumbarton Oaks, and Tudor Place.  The United States Botanic Garden is only a few blocks from SG’s main office as are the Library of Congress and The National Archives.  The U. S. National Arboretum and Kenilworth Park and Aquatic Gardens are both located in D.C.’s northeast quadrant.    

Located a short drive into the Virginia suburbs are the headquarters of the American Horticultural Society and the American Society for Horticultural Science.  Green Spring Gardens and Meadowlark Botanical Gardens are also close by in Virginia.  Sites in nearby Maryland include USDA's National Agricultural Library, Brookside Gardens, and Ladew Topiary Gardens.