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From the firm of Wolfgang Oehme and James Van Sweden, known for their use of grasses and perennials, often natives, a garden on the roof of the Federal Reserve Parking lot in Washington, DC. The 30-year-old garden was recently renovated. No information on whether stimulus money was used.
Photo by Roger Foley from the Oehme, Van Sweden website. More photos here.

Built in 1995, the roof on the Vancouver Public Library was designed to echo the Fraser River and its surroundings. The roof is planted in 14 inches of growing medium laid over a drainage layer and a rubberized asphalt membrane (designed by American Hydrotech, from whose website this photo was taken). Plants include various blue fescues, to represent the river, and kinnikinnick (Arctostaphylos uva ursi). The roof is visible from surrounding buildings and has some runoff mitigation benefits.
The building was designed by Moshe Safdie. The landscape architect was Cornelia Hahn Oberlander. More about her work soon.
The famous grass bed, with sedges and sweet-smelling Acorus as a mattress, designed by John Greenlee in Pomona, California. Taken about 8 years ago.