Are weeping willow roots a problem for foundations or pipes?
Willow roots are shallow, fibrous, and aggressively water-seeking, traveling well past the dripline; this is the species most often found inside a cracked clay sewer lateral, a field tile, or a septic line. On heavy central Indiana clay where water perches near the surface, they stay in the top foot or so and heave patios, walks, and drives instead of diving deep — siting guidance is 50 feet or more from any of that, which almost no existing yard willow respects.
Size drives root spread
Typically 30 to 50 feet tall with an equal or greater spread, reached in 15 to 20 years at up to several feet of growth a year; published lifespans vary widely, from roughly 20 to 30 years in a stressed yard setting up to 50 or more on a consistently wet site. Because the wood is heavy and water-soaked, the crown is broad, and the unions are unpredictable, a mature willow prices at the top of its height bracket — closer to a 60-foot maple than a 40-foot tree.
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