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Facilitation between species could be used to increase the number of plant species that can survive on an extensive green roof. Green roofs are associated with high substrate temperatures and water loss which can lead to plant death. Therefore, species that are known to cool substrate temperatures and reduce water loss may be able to act as facilitators. Three drought tolerant, mat-forming species native to Nova Scotia were tested. Species included Cladonia spp. (lichen), Polytrichum commune (acrocarpous moss), and Danthonia spicata (bunchgrass). The target species was the forb Solidago bicolor. Additional neighbour treatments included an artificial plant, conspecific neighbours (S. bicolor surrounded by 8 S. bicolor), and a no-neighbour control. This study was conducted over a two year period in green roof modules. Overall, none of the neighbour treatments appeared to facilitate the growth of S. bicolor …