[glynnjamin]

The other problem with non-native trees is their root structure. I'm sure you've all seen what the trees here in AZ do. Instead of their roots going deep, they spread wide and stay near the surface due to the dense clay. These roots do quite a number on infrastructure (sidewalks, streets, water lines) as they grow. Those little palo verdes don't do much for shade but their roots don't rip up the street.

I'm still all for more shade trees but they need to be planted properly.