Good question. It is, in part, a case of form following funding…
The project is almost entirely funded by the watershed district (if this project receives an implementation grant). The district is as urbanized as one can get in MN and see this project as a demonstration for urban stormwater retrofit practices.
Also, the space is more limited than perhaps what the images reflect along with the client interested in maintaining sun exposure on this south facade, provide bicycle parking for the building, etc.
We are looking at our options to make the living wall put to the best use in our climate, including having wall hangers hung inside the building so it can be used for its air quality benefits during the winter.