Cherry blossoms are the symbol of spring in Washington DC © Barbara Noe Kennedy

Dumbarton Oaks Famous landscape architect Beatrix Farrand designed this botanical

panorama in northern Georgetown. At Dumbarton Oaks, each sweet-smelling garden is more beautiful than the next. Be sure to check the website (www.doaks.org) before your visit to see what’s in bloom, but must-sees include the Orangery, where the climbing ficus dates from the 1860s; the rose garden, arranged by color; the Prunus Walk with its flowering plums; and the Pebble Garden, best viewed from the terrace above to take in the intricate, swirling neo-baroque designs of grey and white stones. It’s a shame that picnicking isn’t permitted on the grounds. River Farm Did George Washington ever wander past the centuries-old Osage orange tree that dominates River Farm’s Garden Calm? It’s possible. The first president owned these 25 park-like acres along the Potomac River just south of DC, and the story goes that the tree was a gift from Thomas Jefferson to the Washington family. Among the pocket gardens here, you’ll find a grove of Franklin trees (extinct in the wild), an orchard of pear, apple and plum trees, and an azalea garden with a rainbow of different species. The American Horticultural Society (www.ahsgardening.org) now resides in the restored estate house and hosts such popular events as the Spring Garden Market in April.