I’m in the conceptual design process and thinking about using Green roofs on a couple of the structures proposed on the site. The structures will likely be fitted either entirely or partially with vegetated roofs. I’ve read many different articles stating many different things about the success of the plants, and the amount of irrigation required. I guess people typically specify different varieties of Sedum as the main plant material, but how much irrigation, if any is typically required? And are there other plant materials that are known to be just as successful with or without irrigation. If irrigation is thought to be necessary for extended periods of time, it is likely that we will propose a cistern (sizing it is the source of all these questions)to handle the job. Any knowledge or experience with these matters would be most appreciated. Thanks!
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