For an extensive green roof (sedum, wildflower and brown roofs), irrigation to saturation is required for the initial establishment of the green roof. This is because the roots haven’t taken to the substrate and can dry out fairly quickly. After few weeks the roots would have taken and the roof should be self-sustaining in most cases. If installed in the summer months, the watering in may be needed more frequently Usually Roof gardens will require a permanent irrigation system.
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