Green roofs are a means of utilizing, typically, unused space by growing vegetation on building rooftops. Green roofs are a collection of materials, including vegetation, growing medium, drainage filter, etc. These can be extensive by retrofitting them on existing building roofs or intensive through practices of incorporating them into the design of new buildings. They have a range of applications including capturing excess stormwater, aesthetics, insulation, wildlife habitat, and local food production. Check out the City of Edmonton website for more information and where green roofs are already established in the city.