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Terrific idea that needs careful condiderations. One point uis the science based information. More info is coming to hand about micchorryza and the connections between plants including trees. I believe many verge trees are not very happy, due to lack of companion planting to share water and nutrients. Look at the ornamental plums e.g. Mine is very sick. It needs company.

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That's one of the reasons to stick with council-planted street trees and local native plants as the understory. Councils also have the qualified staff and resources to keep up with research on which trees will cope best with the changing climate. Community nurseries can provide plants and advice on local species to residents for the understory.

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