LONDON - MAY 13: Various types of lettuce grow in vegetable allotments on display as part of Spring Renaissance, in Covent Garden on May 13, 2008 in London, England. Spring Renaissance runs from April 23 to May 18 and hosts numerous gardening and floral related events including this example of a working allotment, in which a variety of fruit and vegetables grow. (Photo by Cate Gillon/Getty Images)
