The green space remains untouched.

Creating green spaces on walls is a smart way to allow plants to grow on a surface that doesn't require (or rarely requires) additional area. Two main concepts emerge in this context: rigid green walls and movable green walls.
Both concepts share the meaning of green living. A rigid green wall (green wall) is a dependent, vertical structure attached to apartments and houses. The plants used in this design are climbing plants, allowing the vines to cover the vertical surface with a woven texture along the established structure. Because of the fixed nature of the design, the plants can be started from the ground and take root in the soil. Its limitation is that when implementing this solution, one often has to consider the sustainable maintenance of the house and the durability of the wall related to the penetration of plants as they cling to the wall surface.

The house was camouflaged with vines.

Mobile green walls (living walls) are a version similar to rigid green walls, arranged independently and individually. The structure also includes vertical surfaces covered with greenery. However, due to its mobility, the plants on these walls are essentially not connected to the ground as with rigid walls. With this version, independent compartments can be arranged to grow multiple individual plants interwoven, not necessarily vertically, but horizontally or stacked on top of each other. Because of their independent life, mobile green walls are also called living walls. Living walls can give viewers an interesting feeling depending on the rich diversity of plant species and the ability to influence the plants' growth patterns by inverting or rotating them horizontally.

A living wall in a restaurant

With their greening function, both types of walls offer environmental benefits, reducing heat absorption, purifying the air, and shielding against dust. Green walls also have some degree of sound insulation. Studies have also shown that lush green surroundings contribute to a better psychological state for people.
Establishing these walls isn't a difficult task. The important thing is how homeowners perceive their role and value in greening spaces to regulate temperature and purify the air. Prioritizing green space or using that space for other purposes can hinder the creation of these walls, especially living walls, as they can occupy additional area and require significant investment in design. Therefore, it's difficult to implement a system of green walls across urban areas without the conscious awareness of the homeowners.
Some cities in developed countries mandate regulations on the color and architectural design of apartment facades. However, regulations requiring the creation of green spaces on the walls of apartments are only mandatory in some cities or countries. This suggests that the creation of numerous urban green walls remains largely a matter of encouragement.

Basel is the first city in the world to completely green its high-rise buildings to adapt to climate change.

In Vietnam, the practice of greening walls has been around for quite some time. However, as analyzed above, it has appeared sporadically and is entirely subjective. Essentially, it has only focused on greening hard walls; living walls are a rare occurrence, even though designing them is within reach and not beyond the financial capabilities of many families.

While the need for sustainable urban cooling is becoming increasingly urgent, enhancing urban green spaces through the form of green walls – living walls – is considered a highly optimal solution but has not been given sufficient importance. When will this solution be incorporated into urban design regulations? When will homeowners be taxed for not developing green spaces, as is the case in some countries? The answers seem to remain open.

Source: https://dttg.baotainguyenmoitruong.vn/mang-xanh-con-bo-ngo-359596.html