Biotecture have successfully trialled a wall which grew 45 varieties of vegetable.

CNN: Green walls create new urban jungles

"They're living walls, and they come in all sorts of colors, not just green, " Richard Sabin of BioTecture told CNN, and whose walls have been incorporated in Gold and Silver Gilt medal-winning gardens at the Royal Horticultural Society's Chelsea Flower Show, London.

CNN: Green walls: the growing success of 'vegitecture'