I am probably the only planner in the US who does not like street trees in small downtowns. They require enormous nurturing. Public works waters, and tends, and replants. Business owners hate them for obscuring signs. I have always suspected that the tree vandalism blamed on the youth of the town really is perpetrated by merchants who don't like the trees. Trash collects in the street grates. If we want shade in downtown, lets install awnings.
I am an ardent environmentalist,I love trees, but geeze, lets put them in residential areas, parks and greenways. Lets create clusters mid block.