Weeds find height no barrier to rooftop gardens

04/26/2010 | NYTimes.com

Green roofs face the same problems with weeds as their counterparts on the ground. Wind dispersal and birds can blow weeds onto the roof, or weeds can enter the roof through sedum or soil. "The weeds are welcome here," said Anasa Scott, the general manager of City College of New York's Greenproofing.org.

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