Green façades can help to cool cities and buildings best when they are irrigated to provide good canopy growth and transpiration cooling. Irrigating green façades with greywater can reduce potable water demand and make use of building greywater supplies, however, greywater may negatively impact climbing plant growth through salt accumulation. We evaluated the effects of greywater irrigation on substrate properties (pH and EC) and the growth of six climbing plant species in an 18-week glasshouse experiment. Three irrigation treatments were applied to climbing plants: (1) potable water, (2) greywater, and (3) greywater flushed with potable water once every three weeks. Substrate pH did not differ among treatments, but substrate EC was greatest when irrigated with greywater flushed with potable water. Greywater irrigation was not detrimental to climbing plant growth, demonstrating that domestic greywater could replace potable water irrigation of building green façades in urban environments.

灌溉时，绿色立面可以最好地为城市和建筑物降温，以提供良好的树冠生长和蒸腾作用。用灰水灌溉绿色立面可以减少饮用水需求并利用建筑灰水供应，但是，灰水可能通过盐分累积对攀援植物的生长产生负面影响。在一个为期18周的温室实验中，我们评估了灰水灌溉对基质特性（pH和EC）以及6种攀缘植物物种生长的影响。对攀缘植物进行了三种灌溉处理：（1）饮用水，（2）灰水和（3）每三周用饮用水冲洗一次的灰水。处理之间的底物pH值没有差异，但是当用用冲刷的饮用水冲洗的底水冲洗时，底物EC最大。