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Crazy About Cacti and Succulents - Brooklyn Botanic Garden
The green roof is typically created with three to six inches of growing medium, has no irrigation system, has a very limited maintenance budget, and serves a practical rather than aesthetic purpose. All year long, the extensive green roof soaks up storm water that would otherwise run off, taxing city sewer systems. Extensive green roofs also help lower ambient temperatures during the summer months, lowering cooling costs and helping to mitigate the so-called urban heat island effect.