Arborists see trees very differently from how most of us see them. They know their trees very intimately, and by botanical name. Arborists know how big particular trees get, both tall and wide, and if they are likely to develop structural deficiency or aggressive roots. They can tell us which are deciduous, which are evergreen, and which are messy with foliage, bloom or fruit.

Some arborists are happy to divulge a bit of history of some trees, whether exotic or native. They might tell us where the exotic trees came from, and why they were imported. Some trees were brought for timber. Some were brought for fuel. Some were imported just because they were pretty. Some naturalized, and now impose on the natural ecosystem. Natives try to adapt.

Since they know the innate characteristics of trees, arborists know what their cultural preferences are. They know that some are understory trees…