The Vertical Forest is an architectural concept which replaces traditional materials on urban surfaces, using the changing polychromy of leaves for its walls. The biological architect relies on a screen of vegetation, needing to create a suitable microclimate and filter sunlight, and rejecting the narrow technological and mechanical approach to environmental sustainability. (Boeri Studio, 2020). The first analysis of the NBS impacts after the first year of the implementation stated that it is evident that the presence of terraces and additional trees decreases the amount of collected solar radiation during the winter season by 32% and 21% for configurations “C.a” (external walls, green terraces, trees) and “C.b” (external walls, green terraces, NO trees) respectively, compared with configuration “C.c” (external walls, NO green terraces, NO trees), thus resulting in 44% and 24% higher space-heating energy needs, respectively. On the other hand, in configurations “C.a” and “C.b”, terraces and trees block 49% and 35% of the solar radiation entering the reference floor in summer, compared with configuration “C.c”, thus making it possible to decrease space-cooling energy consumption by about 68% and 46% respectively. (Giacomello, Valagussa, 2015). The facade temperature registered during the summer is 30 degrees lower thanks to the water vapour emitted from the watered plants (Giacomello, Valagussa, 2015; Naturvation project, 2020). The diversity of plants protects against noise pollution (Boeri Studio, 2020). An indicator that turned out negatively for this NBS was the time dedicated to tree maintenance, as Giacomello and Valagussa (2015) observed that the time for pruning one tree in the vertical forest is five times higher than pruning a tree with the same characteristics at ground level. This implies high maintenance costs (Giacomello, Valagussa, 2015; Naturvation project, 2020).