
Mature around 15 to 30 feet tall with a 15 to 25 foot spread, dense and low-branched from near the ground. It is long-lived for its size — old fencerow hawthorns in central Indiana routinely predate the subdivisions built around them — and removals fall in the small-tree bracket by dimension but should be quoted above it for thorn handling, protective gear and slow cleanup.
Deep and tough once established, and that is exactly why hawthorn survives the sites that kill other small trees here — dry compacted clay strips, parking lot islands and salted tree lawns, since it turns up consistently on the salt-tolerant species lists. Cockspur and dotted hawthorn do particularly well on limy and glacial soils, which describes a lot of central Indiana ground.