
Native to a narrow band along the lower Ohio and Wabash country and planted far beyond it, so central Indiana has plenty in fencerows, alleys, and old farmsteads where it was grown for rot-resistant posts. Almost none are being planted today, which means the standing population here is aging into its failure window all at roughly the same time.
Catalpa is the coarse old tree on the back fence line — heart-shaped leaves the size of a hand, orchid-like white flowers in June, and foot-and-a-half seed pods. Most catalpa quotes in central Indiana are cleanup and reduction on a 50-year-old tree that has already dropped a limb or two, because it grows fast, breaks easily, and is structurally spent about the time it gets big enough to matter.