Vertical green systems represent vertical surface with living plants. There are two main types of vegetated wall: traditional direct covering of a vertical surface and indirect vertical surface using additional support system to ensure air gap between the vegetation and the wall. An option to plant vegetation in planter boxes is implemented when the ground planting is not possible. Green walls have the potential to improve urban microclimate and visual site characteristics. They affect urban heat island by direct sunshade and by increasing air quality and humidity, improve acoustic environment and biodiversity. Green walls are relevant for compact city structure and areas with properties flanked by high solid fences. They can be used as noise and air pollutant screens, living elements in spatial organization of places, and for improving the aesthetics of a site.

• Provide important ecosystem services in areas with sealed urban structure with no space for conventional urban greening;
• They provide improved air quality, heat island effect reduction, energy cost reduction, noise level reduction, visual benefits, increased biodiversity by creating habitats for birds and beneficial insects.

• Can cover wide range of scales. Specific requirements could indicate different area of vegetation that could be ground planted or placed in planter boxes;
• Implementation is relatively easy and cheap to perform without special qualification. Constraints are imposed on the planting.