I took these photos on 4 Apr 10.
I heard about this during a recent workshop so when I was in the area recently, I looked up and there they were - the columns cladded with greenery.
With my 15x zoom camera, I managed to get a close-up photo of the green column without actually going up to the floor. From the distance, it did not appear that the plants had completely covered the column. I attributed this to the fact that it was relatively newly planted and the plants do need time to grow. What is interesting about the design is the columns can be rotated so that the plants can be exposed to sufficient sunlight periodically for better growth.