How big does a northern catalpa get and how long does it live?
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.
Spread below ground too
Catalpa roots are coarse and reasonably deep, and it simply is not a hardscape-conflict tree — you rarely find it lifting a drive or in a sewer lateral. What it does have is broad tolerance for central Indiana's worst conditions: alkaline clay, road salt, and both wet and dry sites, which is why so many survive untended in ditch banks, alleys, and old farm lots.
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