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BERLIN, GERMANY - APRIL 05: A visitor carries a small tree at the biannual gardeners' market at the Botanical Gardens on April 5, 2014 in Berlin, Germany. Approximately 100 nurseries and gardening retailers are offering gardening enthusiasts tips and supplies this weekend. Spring weather has arrived in Germany and garden lovers across the country are busy planting for the new season. (Photo by Clemens Bilan/Getty Images)

BERLIN, GERMANY - APRIL 05:  A visitor carries a small tree at the biannual gardeners' market at the Botanical Gardens on April 5, 2014 in Berlin, Germany. Approximately 100 nurseries and gardening retailers are offering gardening enthusiasts tips and supplies this weekend. Spring weather has arrived in Germany and garden lovers across the country are busy planting for the new season.  (Photo by Clemens Bilan/Getty Images)