How is it made?
Living sound barriers are built “sandwich-style.” Two membranes supported by a rigid structure surround a layer of soil in which vegetation is planted, keeping the soil in place. The plants green the structure to the point of hiding it entirely. The resulting mass of vegetation is a highly effective noise abatement system.
In the case of walls attached to buildings, a more complex technology is used. Water fortified with nutrients percolates from the top to the bottom based on a programmed cycle. Of course, as with any phytotechnology, it is important to select plants that are well suited to the environment.