Vertical greening has attracted increasing interest during recent years as a way of maintaining areas of vegetation despite increased urban densification. Living wall systems are a novel form of vertical greening in the Scandinavian climate and there is a lack of scientific knowledge on their functioning. We have performed a full-scale field experiment in an industrial area in Malmö, south-western Sweden, to compare the qualityquality and coverage of 16 plant species in two systems used for vertical greening. We hypothesized and found that: (1) living wall systems with perennial plants are feasible in the Scandinavian climate, (2) the qualityquality of plants was better and (2) the area covered was greater in the Rockwool system than in the pumice-filled pocket system. Individual plant species responded differently in the two systems. For example, Antennaria dioica seemed to perform well -in terms of qualityvisual quality -in the Rockwool system, but this was not reflected in the area covered. Achillea millefolia, on the other hand, showed better performance in the pumice-filled pocket system in terms of qualityquality, but this was not reflected in the area covered by the plants. Other species, such as Armeria maritima, did not perform better in either system in terms of qualityquality, but the area covered was higher in
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