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The house's green roof is more of a brown roof: a desert-like array of native and non-native succulents that require minimal irrigation. The soil area is maintained with motorcycle tires (including one from a Harley hog), which control erosion. Composting takes place here as well. Tagged: Outdoor, Gardens, and Rooftop.  Best Photos from This Net-Zero Residence Might Be the Greenest Home in San Francisco
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