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Visitors walk through a tunnel of clematis at the Raymond Evison Clematis stand at the Chelsea Flower Show in London May 21, 2013. REUTERS/Luke MacGregor ( BRITAIN/ )

Visitors admire the azaleas on display in The Great Pavilion at the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169188630 )

Cacti are displayed on the 'Southfield Nursery' stand at the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169178484 )

A woman with flowers in her blue dyed hair looks at chrysanthemums at the Chelsea Flower Show in London May 21, 2013. REUTERS/Luke MacGregor ( BRITAIN/ )

A woman walks waits in front of two Union flags designed in flowers outside the Floral Design room at the Chelsea Flower Show in London May 21, 2013. REUTERS/Luke MacGregor ( BRITAIN/ )

Visitors admire the gardens along Serpentine Walk of the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169180436 )

Strawberries are grown in a pair of old boots on the Ken Muir stand in The Great Pavilion at the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169179818 )

Pitcher plants are displayed on the Hewitt-Cooper Carnivorous Plants stand in The Great Pavilion at the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169179856 )

Visitors admire the flora on the Hardy Plant Society stand in The Great Pavilion at the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169179844 )

Visitors admire the plants on display in The Great Pavilion at the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169180434 )

A stallholder sells wellington boots at the Chelsea Flower Show in London May 21, 2013. REUTERS/Luke MacGregor ( BRITAIN/ )

A screen depicting a garden scene is erected next to a temporary marquee at the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169180260 )

Visitors admire lilium on display in The Great Pavilion at the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169180011 )

Pinball Wizard Allium are pictured at the Chelsea Flower Show in London May 21, 2013. REUTERS/Luke MacGregor ( BRITAIN/ )

A woman admires roses on display in The Great Pavilion at the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169179977 )

A gerbera is suspended as part of the Interflora display at the Chelsea Flower Show in London May 21, 2013. REUTERS/Luke MacGregor ( BRITAIN/ )

Pots of flowers hang from a wall on the Interflora display at the Chelsea Flower Show in London May 21, 2013. REUTERS/Luke MacGregor ( BRITAIN/ )

A Rebutia muscula cactus on display on the 'Southfield Nursery' stand at the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169188635 )

Water spouts from a creation by sculptor Mehrdad Tafreshi at the Quist stand at the Chelsea Flower Show in London May 21, 2013. REUTERS/Luke MacGregor ( BRITAIN/ )

Visitors admire the show gardens at the RHS Chelsea Flower Show on May 21, 2013 in London, England. The Chelsea Flower Show run by the RHS celebrates its 100th birthday this year. (Photo by Oli Scarff/Getty Images) ( 169180271 )

Director of Fleming's nurseries Wes Fleming (black coat), Garden Designer Phillip Johnson (checked shirt) and volunteer Tim Wilkinson (jumping) celebrate the Trailfinders Australian Garden winning the gold medal and Best in Show at the Chelsea Flower Show 2013 at Royal Hospital Chelsea on May 21, 2013 in London, England. (Photo by Tim P. Whitby/Getty Images for the 2013 Chelsea Flower Show Trailfinders Australian Garden) ( 169168816 )

Two ladies have a conversation while sitting on a wall at the Chelsea Flower Show in London on May 21, 2013. The world-famous gardening event run by the Royal Horticultural Society (RHS) is celebrating its centenary year. The Trailfinders Australian Garden was awarded Best Show Garden. ADRIAN DENNIS/AFP/Getty Images ( 519932532 )