
The heaviest-debris tree on this list, in three distinct waves — white flowers carpeting the drive in June, oversized leaves that blacken and drop early after the first hard frost, and 8-to-20-inch bean pods falling all winter that a mower will not mulch. Some years catalpa sphinx caterpillars add a fourth wave: mass defoliation plus frass raining onto whatever is below, which homeowners routinely mistake for a fatal problem.
Roughly 40 to 60 feet tall and 20 to 40 wide, fast-growing, and short-lived for its size — commonly cited at around 50 years. So a catalpa often becomes a large-tree removal price on a tree that only stood for one generation, and the wide spreading crown over a fence, alley, or garage usually forces a rigging job rather than a straight drop.