Longwood Gardens in Kennett Square, Pennsylvania, grew from a landscape used for thousands of years by Lenni Lenape people into one of the nation’s best-known public horticultural estates. After George Peirce’s family established a farm and arboretum there in the 18th century, Pierre S. du Pont bought the property in 1906 to save its trees and transformed it into an elaborate garden, opening it to the public in 1921. Known especially for its fountains, conservatories, and seasonal displays, Longwood later expanded with major new gardens, restoration projects, and educational programs. Its significance also includes conservation, native habitat management, and stewardship of a historic landscape.