LONDON, ENGLAND - FEBRUARY 04: Kew horticulturists Teresa Errazuriz (foreground) and Jules Hayward tend to orchids in the Royal Botanic Gardens' Tropical Extravaganza on February 4, 2010 in London, England. The 'Tropical Extravaganza' is Kew Gardens' first festival of its 'Biodiversity Year' and features over 7000 tropical plants including over 3000 orchids. (Photo by Oli Scarff/Getty Images)

LONDON, ENGLAND - FEBRUARY 04: Kew horticulturists Teresa Errazuriz (foreground) and Jules Hayward tend to orchids in the Royal Botanic Gardens' Tropical Extravaganza on February 4, 2010 in London, England. The 'Tropical Extravaganza' is Kew Gardens' first festival of its 'Biodiversity Year' and features over 7000 tropical plants including over 3000 orchids. (Photo by Oli Scarff/Getty Images)