Many contemporary buildings, including modern, energy-efficient ones do not provide a healthy internal microclimate (optimal conditions conducive to human health, including mental health) and proper acoustic conditions. In many cases these buildings include pre-schools, elementary schools, high schools, office buildings, retail buildings as well as residential buildings. There is a recurring problem with a low relative humidity, high CO2 content (large fluctuations in CO2 concentrations when more people stay in the rooms), and the need for summertime air-conditioning because of high temperatures, which is not an energy-efficient process. Many people are sensitive to air-conditioning and suffer health problems as a result. Acoustic conditions are a common issue in educational establishments or in new, modern, open-space office buildings. The problem is mainly due to the low sound absorptions of the internal surfaces and the high reverberation time in these areas.

A good solution to these problems is the use of green walls. Plants have the ability to effectively regulate indoor temperature and humidity, they produce O2, absorb dust and other harmful particles and even improve acoustic conditions by absorbing sound/noise. Another substantial benefit of plants is their positive influence on the mental health of inhabitants.