Hanging Gardens

Something that I have seen quite a few times in Mexico City is a vertical garden on the façade of a building.  The wall of the building has hundreds of pockets in which plants are placed.  As the plants grow the entire wall is covered with vegetation.

This apartment building in the neighborhood where I stayed has a very nice example of that technique.  It included hoses that kept the plants watered with drip irrigation.  

I have not seen anything like it up here, but of course, in the land of winter, it would be a real chore to replant the wall every spring.  I wonder if this idea has caught on in the frost-free regions of the southern U.S.