Due to the growth of modern cities, especially in metropolitan regions, the urban heat island has become a significant issue. In an effort to increase urban greenery and provide passive cooling, architects, engineers, building planners, and academics are turning their focus to vertical greenery systems (VGS). Greening the building envelope is not merely a matter of covering the outside of the structure with greenery. Green roofs and walls are often used as decorative elements in buildings. Green infrastructure research and development is growing gradually, deciding aesthetic enhancements as well as environmental, social, and economic advantages. Features like energy conservation, thermal insulation, environmental quality, health, and evapotranspiration underline the critical function of the vertical greenery system. However, these technologies may optimise the functional advantages of plants towards the performance of buildings and contribute to a sustainable urban rehabilitation and retrofitting strategy. Green wall systems design has been a major emphasis in recent years to obtain more efficient technological solutions and better performance throughout the construction process. In addition to lowering temperatures, vertical greenery systems provide other economic, environmental, and social advantages. According to the findings of the literature review, green roofs and facades are essential tools for reducing energy usage and greenhouse gas emissions.