This feb. 28, 2013 photo shows Steve Eshelman with Stoney Bank Nurseries working on an installation in preparation for the annual Philadelphia Flower Show at the Pennsylvania Convention Center in Philadelphia. More than 270,000 people are expected to converge on the Pennsylvania Convention Center for the event, which runs through March 10. Billed as the world's largest indoor flower show, it's also one of the oldest, dating back to 1829. (AP Photo/Matt Rourke)

Associated Press
This feb. 28, 2013 photo shows Steve Eshelman with Stoney Bank Nurseries working on an installation in preparation for the annual Philadelphia Flower Show at the Pennsylvania Convention Center in Philadelphia. More than 270,000 people are expected to converge on the Pennsylvania Convention Center for the event, which runs through March 10. Billed as the world's largest indoor flower show, it's also one of the oldest, dating back to 1829. (AP Photo/Matt Rourke)
This feb. 28, 2013 photo shows Steve Eshelman with Stoney Bank Nurseries working on an installation in preparation for the annual Philadelphia Flower Show at the Pennsylvania Convention Center in Philadelphia. More than 270,000 people are expected to converge on the Pennsylvania Convention Center for the event, which runs through March 10. Billed as the world's largest indoor flower show, it's also one of the oldest, dating back to 1829. (AP Photo/Matt Rourke)
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