Pruning a vertical surface can be a tricky proposition at best, so species selection done from the outset is a crucial key to success. You need rugged and robust plants fit for the region, for starters. The architect thought carefully about the plants picked for the outside faces of this stunning four-story structure, selecting varieties that would weather well and grow (but not too much!) in their environs in Lisbon, Portugal.
The result is a green wrap that provides shade, fresh air and, critically, appealing aromas – smell is another critical consideration in living walls, particularly when you have a rooftop deck with a sunken swimming pool that runs along the outside edge of the greenery. Nearly five thousand total plants now thrive along the multiple vertical surfaces of the building, creating a dynamic, slowly-evolving facade as the species vie for water, sunlight and space.
Courtesy of http://dornob.com