Here's an idea: create a "Leafy Street" competition instead. Measure it by the percentage of shade over the road reserve at midday in summer. Heavily publicise the winners and create a bit of "street envy". Culture change can be achieved, it just takes a consistent effort over time.
Mr/Ms Parks and Gardens Manager: why not make "leafy" your legacy to the Town / City you serve?
Generations will love you for it.
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