A Green Wall or otherwise, a Vertical Garden, named by the initiator, the French botanist Patrick Blanc, is any vertical surface or building which is planned with plants.
A specific substrate is mounted through a special aluminum construction. The plants are planted on this specific substrate. Watering and fertilization are made with an automatic irrigation system.
The other case of Vertical Garden or otherwise, Green Wall, is when a climbing plant grow upon any vertical surface.
Either way the Green is always a source of life.