Is there a danger of dry plants catching and spreading fire?
Not if the green roof is designed correctly. In Germany, green roofs actually have a better fire rating than conventional roofs because the mineral media layers cannot burn. The extensive use of Sedums (a type of succulent) and gravel borders and breaks also protect against fire. In an arid, fire-prone region, require your designer to engineer the system with fire-retardant features, paying special attention to mineral content, gravel layers, and plant selection.
