The Verdant apartments in Perth’s CBD have a strong focus on energy efficiency and incorporate a 3-story external green wall. Vegetation grows in either a light-weight panel system for internal green walls, and in a plastic bauxite system for external green walls, both designed to retain nutrients and water. Each panel is 1.5 m long and 40 mm deep, and incorporate a water retention mat at the back of the panel into which plants grow. Plants are grown for 3-6 months before installation in order to ensure establishment.
Some challenges in establishing green walls include:
- Drying out of plant pores by nearby air conditioning vents;
- Over-heating of plants from sunlight allowed in by windows; and
- Ensuring appropriate irrigation is achieved.