Lots of Municipalities/Cities require planting of trees be done such that there's a variety of species. https://en.wikipedia.org/wiki/Dutch_elm_disease https:/

Lots of Municipalities/Cities require planting of trees be done such that there's a variety of species. https://en.wikipedia.org/wiki/Dutch_elm_disease https://en.wikipedia.org/wiki/Dutch_elm_disease (also transmitted by a beetle) https://en.wikipedia.org/wiki/Emerald_ash_borer https://en.wikipedia.org/wiki/Emerald_ash_borer etc