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Best plants for garden roofs

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They reviewed 216 species: a job that lasted five years, and that eventually led researchers from the Chicago Botanic Garden to locate nine plants that most of all suited to the cultivation of green roofs, the roof garden.What they are and how they identified? First, the research have been devoted to the two roofs in the botanical garden, with different exposure and a total of 750 square meters.They evaluated both green roofs intensive" (ie with a layer of earth from 7 to 14 centimeters), that "extensive (15 to 20 centimeters).Through the analysis of data on air temperature and soil heat fluxes, solar radiation, humidity and wind, rainfall, 216 plant species were examined under various parameters: survival and resistance during research, health and vigor, tolerance of heat, cold, drought.And finally here it is, the nine species that have been identified as "five star", the most fulfilling all the criteria and better suited to survive on rooftops: Antennaria dioica, calamine Mintha nepeta ssp. nepeta, Juniperus chinensis var. sargentii 'Viridis', Phlox subu- lata 'Apple Blossom', Phlox subulata 'Emer- ald Blue', Phlox subulata 'Snowflake', Rhus aromatic 'Gro-Low', Sporobolus heterole- pis, and Sporobolus heterolepis 'Tara'.Credits: Chicago Botanic Garden Photos"

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