Green roofs sprouting in Rocky Mountains

Reuters: On a small farm in Montana's Bitterroot Valley, Nate Lengacher recently harvested thousands of sedums: low-maintenance plants with a key place in the small but growing world of green roofing. Lengacher's sedums are succulent plants that store water in their leaves and grow from a multilayered system of soil and root and water barriers. On roofs, the plants moderate building-top temperatures and cut heating and cooling costs below. Pointing to the rows of mats topped by thin layers of soil and......

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