after Mellon's landscaping Although she had no formal training, Mellon read widely in horticulture and made contributions to several landmark gardens. Her interests in gardening were first cultivated while watching
Olmsted Brothers gardeners tend the formal gardens at "Albemarle", her family's Princeton estate. Mellon amassed a large collection of horticultural books and was regarded as an authority on American horticulture. Her work was strongly influenced by French gardeners
André Le Nôtre and
Jean-Baptiste de La Quintinie. In 1961, President
John F. Kennedy asked Mellon to redesign the
White House Rose Garden. Mellon created more open space for public ceremonies and introduced American species of plants, as well as
Magnolia soulangeana. She next began to work on the White House's East Garden, but her work was interrupted by
Kennedy's assassination. After his funeral, for which Mellon arranged flowers,
Lady Bird Johnson asked Mellon to resume her work on the White House grounds. Mellon completed her work on the garden in close collaboration with
Irvin Williams who, among other responsibilities, she tasked with finding and introducing magnolia trees to the garden. Initially blocked from doing so by the
National Park Service, Williams secretly removed the trees from the
Tidal Basin and transported them to the White House himself. After Jacqueline Kennedy left the White House, Mellon was asked to design landscapes for Kennedy's home in
Martha's Vineyard, the
John F. Kennedy Presidential Library, and
River Farm, the headquarters of the
American Horticultural Society. In France, Mellon created a landscape design for the home of
Hubert de Givenchy and assisted with a restoration of the
potager du Roi in
Versailles. ==Wealth and collections==