Not sure what the formal title for making walls and roofs with plants on them, but it includes green roofing. This is a subject I'm just starting to learn about, but this building is particularly interesting both architecturally and sustainably, so makes a good example.
This structure is a store in Seoul, Korea for clothing designer Ann Demeulemeester. It was designed by Mass Studies and more pics can be seen here. I can't find too much detailed information on it as far as maintenance or numbers, etc.
The exterior on the sides shown are comprised of a geotextile that supports soft, green stemmed (not woody) perennials. In a cold climate these plants will die back in winter but return each spring.
More on this to come.