Green Wall, February 2012. Really neat design, actually; it's planted in flats, so they can remove a small section and replace it with another if necessary. (You can see the row divisions between the young plants here...)
Is it still considered plein air when there are a roof and walls (albeit made of glass)…? (Wish I had taken the time to pull the camera back out; the near-finished painting was rather lovely, much better than the early stages promised.)