Urban densification continues to present a unique set of economic and environmental challenges. A growing shortage of green space and infrastructure is intrinsically linked with urban growth and development. With this comes the loss of ecosystem services such as urban heat island effects, reduction of air quality and biodiversity loss. Vertical greenery systems (VGS) offer an adaptive solution to space-constrained areas that are characteristic of dense urban areas, and can potentially improve the sustainability of cities. However, in order to promote VGS uptake, methods are required to enable systematic appraisal of whether existing walls can be retrofitted with VGS. Further, feasibility studies that quantify the potential for retrofit suitability of VGS across entire urban areas are lacking. This study established an evaluation tool for green wall constructability in urban areas and validated the assessment tool by determining the quantity of walls in five major Australian cities that could potentially have VGS incorporated into the existing infrastructure. Each wall was analysed using an exclusionary set of criteria that evaluated and ranked a wall based on its suitability to VGS implementation. Sydney and Brisbane recorded the greatest proportional length of walls suitable for VGS, with 33.74% and 34.12% respectively. Conversely, Perth's urban centre was the least feasible site in which to incorporate VGS, with over 97% of surveyed walls excluded, mainly due to the prevalence of <1 m high fence lines and glazed shopfronts. This study aimed to evaluate feasibility assessments of green wall retrofitability in highly urbanised areas with the intention of creating an analytical method that is accessible to all. This method, coupled with the promising number of feasible walls found in this study, emphasises the need for more government policy and incentives encouraging green wall uptake and could play a pivotal role in the expansion of green infrastructure and urban forestry.

城市密集化继续带来一系列独特的经济和环境挑战。绿色空间和基础设施的日益短缺与城市增长和发展有着内在的联系。随之而来的是生态系统服务的丧失，例如城市热岛效应、空气质量下降和生物多样性丧失。垂直绿化系统 (VGS) 为具有密集城市地区特征的空间受限区域提供了一种适应性解决方案，并有可能提高城市的可持续性。然而，为了促进 VGS 的吸收，需要一些方法来系统地评估现有的墙壁是否可以用 VGS 进行改造。此外，缺乏量化 VGS 在整个城市地区的改造适用性潜力的可行性研究。本研究建立了城市地区绿化墙可施工性评估工具，并通过确定澳大利亚五个主要城市中可能将 VGS 纳入现有基础设施的墙数量来验证评估工具。每堵墙都使用一组排除标准进行分析，这些标准根据墙对 VGS 实施的适用性进行评估和排名。悉尼和布里斯班记录的适合 VGS 的墙壁长度比例最大，分别为 33.74% 和 34.12%。相反，珀斯的市中心是最不可行的地方，其中包含 VGS，超过 97% 的调查墙壁被排除在外，主要是由于<1 m 高的围栏线和玻璃店面的普遍存在。本研究旨在评估高度城市化地区绿化墙改造的可行性评估，旨在创建一种所有人都可以使用的分析方法。这种方法，加上本研究中发现的可行墙的有希望数量，强调需要更多的政府政策和激励措施来鼓励绿墙的采用，并且可以在扩大绿色基础设施和城市林业方面发挥关键作用。