Are hawthorn roots a problem for foundations or pipes?
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.
Size drives root spread
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.
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