Girdling roots are one of the quieter tree problems we diagnose in Richmond, KY — a root that circles the trunk instead of growing outward, slowly cutting off the tree’s own plumbing until the canopy starts thinning for no obvious reason.
What Are Girdling Roots and How Do You Know You Have One?
A girdling root is a root that grows in a circle or spiral against the trunk instead of outward, and as both grow it slowly chokes off the tree’s own sap flow.
Container-grown trees that sat pot-bound at the nursery, and trees planted too deep or left wrapped in burlap, are the most common source — the root simply never had room to grow the right direction. The University of Maryland Extension lists the visible warning signs: a buried root flare where the trunk goes straight into the ground like a post instead of flaring out, a thinning canopy, premature fall color, stunted growth, and an unexplained lean. On Richmond maples in particular, we see this most on trees planted too deep within the last five to ten years.
Can a Girdling Root Be Fixed, and What Does It Cost?
Yes, if caught before the root is too large — an arborist exposes the root flare and cuts away the offending root, and the tree typically needs two to three growing seasons to recover.
Per the University of Maryland Extension, girdling roots under about a third of the trunk’s diameter can usually be removed without harming the tree; larger or more numerous ones call for a judgment call about whether correction still helps. The work itself is root collar excavation — carefully exposing the flare by hand or air tool and cutting the girdling root — and it prices at our standard crew rate of $150–$400+ per hour, with most excavations running a few hours depending on how deep the flare is buried. Our tree diagnosis visit is free and is where we confirm a girdling root versus one of the other causes of canopy thinning before recommending any work.
Can I check for a girdling root myself?
Pull back mulch at the base of the trunk and look for the flare — if the trunk goes straight into the soil like a telephone pole with no visible widening, that’s worth having looked at.
Does mulch cause girdling roots?
Mulch piled against the trunk doesn’t create the root itself, but it hides a buried flare and encourages roots to grow shallow and toward the trunk, making girdling roots harder to catch early.
Is a girdling root an emergency?
Not usually — it’s a slow decline rather than a sudden hazard, but the earlier it’s addressed the better the tree’s odds of a full recovery.
Not sure if your tree’s decline is a girdling root or something else? Get a free estimate or call or text (859) 310-1209.
Related: Tree Disease & Pest Diagnosis | Arborist Richmond KY | Tree Company Hourly Rate
Source: University of Maryland Extension, Girdling Roots.
Last updated: September 13, 2026