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Flowers are displayed during the Chelsea Flower Show in London, May 20, 2013.
The Chelsea Flower Show, run by the Royal Horticultural Society, celebrates its 100th birthday this year.
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Decorated Gnomes designed by celebrities Alan Titchmarsh, Elton John, Julian Fellowes and Lily Allen are displayed at the Chelsea Flower Show in London, May 20, 2013.
The Royal Horticultural Society (RHS) has lifted a ban on gnomes for this year only and they will be auctioned off as part of the "Chelsea Centenary Appeal" to raise funds for an RHS Campaign for School Gardening.
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Joanna Lumley poses during a photocall at the Chelsea Flower Show in London, May 20, 2013.
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Cacti are displayed on the "Southfield Nursery" stand on the press day at Chelsea Flower Show in London, May 20, 2013.
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A Chelsea Pensioner walks around the stands at the Chelsea Flower Show in London, May 20, 2013 in London.
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Visitor Sue Brown looks through a display stand of trailing plants at the Chelsea Flower Show in London, May 20, 2013.
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A water feature is displayed on a stand at the Chelsea Flower Show in London, May 20, 2013.
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Visitor Sue Brown looks at a stand at the Chelsea Flower in London, May 20, 2013.
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British artist Marc Quinn poses with his sculpture of an orchid in the Royal Horticultural Society garden during the Chelsea Flower Show press day in London, May 20, 2013.
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A gnome sits in a flower pot on a stand at the Chelsea Flower Show in London, May 20, 2013. The Royal Horticultural Society (RHS) has lifted a ban on gnomes for this year only.
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Auricula plants on display in the Great Pavilion during the Chelsea Flower Show in London, May 20, 2013.
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Detail of a flower displayed during the Chelsea Flower Show in London, May 20, 2013.
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Britain's rarest flower, the Lady's Slipper Orchid, is displayed on the "Le Jardin de Yorkshire" stand at the Chelsea Flower Show in London, May 20, 2013.
The Orchid, which was rescued from extinction by scientists and is protected by wildlife laws, is accompanied by its own security.
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Britain's rarest flower, The Lady's Slipper orchid, is guarded by its own security detail at the Chelsea Flower Show in London, May 20, 2013.
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A straw hat sits on a rose garden wall during the Chelsea Flower Show in London, May 20, 2013.
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Visitors walk around the gardens during the Chelsea Flower Show in London, May 20, 2013.
