Britain Chelsea Flower Show

A gardener works in a show garden ‘RBC Blue Water Roof Garden’, designed by Nigel Dunnett and The Landscape Agency, during the Chelsea Flower Show in London, Monday, May 20, 2013. Chelsea Flower Show celebrates its centenary anniversary this year. The garden is an urban, rooftop garden, integrating a recreational space with innovative bio-diversity and habitat features and explores the potential of “skyrise greening” to bring trees, meadows and wetlands into the heart of the densest of cities for the benefit of urban dwellers. (AP Photo/Sang Tan)