Wired has this photo gallery showing the work of botanist Patrick Blanc who specialises in covering walls with gardens. I always loved the look of ivy covered walls at university but this guy takes it to a whole new level.

Over the years he has perfected a special frame which allows plants to grow on vertical walls. Some of the wall gardens are the size of several tennis courts.

They look great. I love the way he has clearly planted different plans in sections to create patters.