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Green Wall at Queen's University, Kingston, Ontario, Canada by Nedlaw Living Walls
A green wall is a wall, either free-standing or part of a building, that is partially or completely covered with vegetation and, in some cases, soil or an inorganic growing medium. They are also referred to as living walls, biowalls, or vertical gardens.
There are two main categories of green walls: green façades and living walls. Green façades are made up of climbing plants either growing directly on a wall or, more recently, specially designed supporting structures. Living walls are made up of pre-vegetated panels or fabric systems that are attached to a structural wall or frame. The modular panels are often comprised of polypropylene plastic containers, geotextiles, irrigation systems, a growing medium and vegetation.[1]
'Active walls' are a relatively new, experimental concept in which a living wall is paired with a building's air circulation system[citation needed]. According to a study done at the University of Waterloo, "Living walls with biofilters increase the capacity of air filtration." [2] Fans draw air through the wall and then circulate the air throughout the building[citation needed]. Air drawn through the living wall is filtered of pollutants by microbes existing in the plants' root systems[citation needed].
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