I have seen this done in a couple of places, but always love to see it done, and often in different ways. This was featured in the New York Times a couple of months ago, but like I said I’ve been storing these ideas for a couple of months now.
From the NYT article, “Vertical Gardens, Grown on Walls” by Kristina Shevory:
Mr. Riley, a former commodities trader turned plant expert who went on to become assistant director of the Horticultural Society of New York, was eager to move beyond potted plants in a way that hadn’t yet occurred to many others. It took a number of expeditions, a lot of research and more than a decade and a half, but by 2003 he had figured out how to grow a wall of plants inside his Upper West Side apartment. …
Vertical gardens — which began as an experiment in 1988 by Patrick Blanc, a French botanist intent on creating a garden without dirt — are becoming increasingly popular at home. Avid and aspiring gardeners, frustrated with little outdoor space, are taking another look at their walls and noticing something new: more space. And a number of companies are selling ready-made systems and all-in-one kits for gardeners like Mr. Riley who want to do it themselves.
These were originally developed by artist Patrick Blanc almost 30 years ago. The NYT article features garden walls in New York, for obvious reasons, but they are also sprouting up in Tacoma, WA, London, Singapore, and other cities.