Yarra Trams and City of Melbourne are planting drought-tolerant grasses and flowers native to Victoria’s volcanic plains on the roofs of tram stops. About 250 square metres of garden have been installed on Melbourne tram stop roofs as of mid-2023.
Check it out here:
https://www.abc.net.au/news/2022-12-10/melbourne-tram-stop-roof-gardens-trial-funded/101757528