Watch - barcelona's 8-foot vertical garden

Architect Juli Capella was tasked- by the city of Barcelona- to design a vertical garden to cover a nearly 70-foot-high windowless wall (leftover after an adjacent building was demolished).

Instead of creating a typical living wall that simply covered the existing surface with plants, he constructed a piece of architecture (or vegitecture) that acts like any conventional building, with a door, stairs and floors. But unlike any other building, it has plants for walls.

Unlike other vertical gardens that require a crane to fertilize or replace plants, gardeners simply climb the stairs and aided by a pulley-system and swappable planter boxes can keep the vertical garden in an ever-green state. A drip irrigation system keeps water use low and upkeep at a minimum.