Researchers differ on best plant species for green roofs

09/14/2010 | New Scientist

The Sedum species of plants, which includes elephant ear and lamb's ear, offers several advantages over other species when used as vegetation on a green roof, according to a researcher from the Royal Horticultural Society in the U.K. Lamb's ear, for example, is a low-maintenance plant with hairy leaves that can survive long periods without rain and maintains the coolest temperature during the hottest weather. But an ecologist at the University of Texas says grasses such as maize and big bluestem are better suited for green roofs in regions that alternate between heavy rain and drought.

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