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→Biodiversity
===Biodiversity===
===Biodiversity===
Biodiversity opportunities are optimized by planting a variety of species. General advice on this has been prepared by the City of Toronto<ref>https://www1.toronto.ca/City%20Of%20Toronto/City%20Planning/Zoning%20&%20Environment/Files/pdf/B/biodiversegreenroofs_2013.pdf</ref>. In the long term, the richness of species increases owing to 'volunteer species'. The desirability of this diversity varies with the aesthetic concerns of the green roof owner.
Biodiversity opportunities are optimized by planting a variety of species. General advice on this has been prepared by the City of Toronto<ref>City of Toronto. 2017. Biodiverse Green Roofs. https://www.toronto.ca/city-government/planning-development/official-plan-guidelines/green-roofs/biodiverse-green-roofs/</ref>. In the long term, the richness of species increases owing to 'volunteer species'. The desirability of this diversity varies with the aesthetic concerns of the green roof owner.
===Design for Maintenance===
===Design for Maintenance===