[qrios]

Thanks for sharing! I had no idea about the “3-30-300 test,” even though I always pay attention to city trees.

I can, however, easily explain the division in Europe: In Italy (for example, in Palermo), the vigorous growth of many species very often leads to significant damage to infrastructure.

Here in Vienna, there’s a directory of trees[1] where you can see, among other things, the species and age.

[1] https://baumkarte.at/

[oasisbob]

As Alex Shigo likes to point out, it's too easy to try and explain infrastructure damage in terms of trees, while giving expansive soils a free pass.

That's like explaining frost-jacking of a wall in terms of temperature instead of hydrology.