A living wall, also referred to as a green wall, vertical garden, or sky farm, is usually part of a building and consists of some sort of vegetation. These types of gardens are sometimes referred to as urban gardening, because they are well-suited for an urban environment where space on the ground is very limited but vertical space is plentiful. These vertical gardens can be quite spectacular in appearance, and in some cases, they even work to filter clean air into the building in which they are growing upon.

Vertical gardens can be grown on just about any type of wall, with or without the use of soil, and they can be placed both on outdoor and indoor walls. As long as there is not shortage of water for the living wall, no soil is required. These amazing sky farms are able to literally bring life to an old rundown building in the middle of the city and they are becoming increasingly popular inside office buildings, homes, and retail stores because of their outstanding beauty and their natural air purification properties.

from www.environmentalgraffiti.com/ecology/15-living-walls-vertical-gardens-sky-farms/1202