
Almost nobody plants this — it arrives as a volunteer in a fencerow, along a back fence or six feet off a foundation, and by the time anyone notices it is a thirty-foot tree with brittle wood and a rotting center. It is also the source of the box elder bugs massing on the sunny south wall every October, and extension guidance on that is blunt: removing the female tree is the reliable control.
Medium tree · On the hazard list · $250–$1,400 typical
Also searched as boxelder, boxelder maple, ash-leaf maple, ash-leaved maple, Manitoba maple, Acer negundo; people also search it as 'the box elder bug tree'.