Royal Botanic Gardens at Kew celebrates 250th Anniversary

LONDON - MAY 5: Queen Elizabeth II plants a tree as the Director of the Royal Botanic Gardens Professor Steve Hopper (L) and the Head of the Arboretum Tony Kirkham (R) look on during a visit to The Royal Botanic Gardens in Kew on May 5, 2009 in London, England. The Royal Botanic Gardens at Kew was celebrating it's 250th Anniversary. (Photo by Johnny Green - WPA Pool/Getty Images)