
Fall-ripening samaras with nearly horizontal 180-degree wings blanket gutters and beds in September and October, and they germinate readily — one tree will seed a fencerow, every mulch bed on the lot, and the neighbor's woodlot. Leaf drop is late, heavy and comes down all at once, typically after everything else has already been cleaned up, which is why it earns a second fall visit.
About 40-50 ft tall by 35-50 ft wide, dense and rounded, commonly living 60-90 years though girdling roots take plenty out well short of that. Mid-bracket removal and normally a straightforward climb-and-rig, but a girdled or badly included trunk base cannot be trusted as a rigging anchor, and that single detail is what pushes some of these into crane jobs.