Green walls?

Not quite green roofs, but I thought this forum best matched the subject. What do you make of green walls? That is, a wall covered in plant life? This is one example:



They're nice for oxidising the air, but they're a lot more limited in their application than green roofs. Additionally, many people don't like the look of them and they can cause cracking in the underlying wall. Would you want to see more of these, or should we just stick to roofing?

Not quite green roofs, but I thought this forum best matched the subject. What do you make of green walls? That is, a wall covered in plant life? This is one example:



They're nice for oxidising the air, but they're a lot more limited in their application than green roofs. Additionally, many people don't like the look of them and they can cause cracking in the underlying wall. Would you want to see more of these, or should we just stick to roofing?

They seem a lot more practical than Green roofs, and as you can't really have solar walls, it would be better to have green on the walls, panels on the roof.

They seem a lot more practical than Green roofs, and as you can't really have solar walls, it would be better to have green on the walls, panels on the roof.

Love this thinking. Green on the walls, solar on the roof. Perhaps we can do this as a solution to the green/solar roof debate? 
On subject, I do like the green walls, but the effect on the architecture would concern me. Roots creating cracks may be an issue, especially when compounded with freeze-thaw.