Green walls are gaining popularity in urban areas for offering aesthetic, shade and thermal benefits. However, with climate change and reduced rainfall, shortages of potable water makes it a restricted irrigation source. This paper investigates the viability of using locally-produced greywater as an alternative source for green wall irrigation. Pilot-scale green façades (a selective configuration of green walls)were established at Bentley Primary School, with plants rooted in stand-alone planters (2500 x 700 x 750 mm) in Perth, Australia, and irrigated with greywater. Inflow and outflow volumes from the planters were monitored from June2019 to December 2020; water balances were established across season, plant type (non-deciduous and deciduous)and orientation (east, west and north facing). The analysis demonstrated that in cooler months (May – September) the irrigation volumes required for plant health was on average 5mm/day Monday ‒ Friday, which increased to 7 mm/day in warmer months. The outflow was highly variable and a function of season, plant type and orientation; in cooler and warmer months it ranged from 0.5 – 4 mm/day, and 0 – 0.2mm/day, respectively. This work illustrates that green façades irrigated by greywater are viable under Perth’s Mediterranean climate, and shows opportunities for reuse of the outflows.