A healthy tree radiates its major roots outward from the base of the trunk like spokes on a wheel. Girdling roots are roots that deviate from that pattern and instead grow in a circular path that wraps around or presses against the trunk. Over time, as both the trunk and the root continue to grow in diameter, the crossing root compresses the outer layers of the trunk, restricting or cutting off the flow of water and nutrients through the vascular tissue just beneath the bark.
The more precise term for the most damaging version of this problem is stem girdling roots, which specifically refers to roots circling at or just below the soil line where they make direct contact with the trunk. Unlike roots that cross deeper in the soil with minimal effect, stem girdling roots press against the cambium layer, the living tissue responsible for transporting what the tree needs to grow and survive. The restriction is gradual, which is why the damage accumulates for years before the tree shows visible signs that something is wrong.
Girdling roots rarely develop by accident. There are three primary causes, and two of them trace directly back to decisions made at planting time.
A tree planted too deep is the single most common cause of girdling roots in residential landscapes. When the root flare is buried beneath the soil line, roots that would normally spread outward at or near the surface are instead pushed down into deeper soil where they encounter less resistance by growing laterally and circling back toward the trunk. Doug Beckmann and Meyer’s certified arborists emphasize root flare depth on every planting job for exactly this reason: the consequences of getting it wrong are not visible for years, but they are very difficult to reverse once they develop.
Trees grown in nursery containers can develop circling roots that conform to the shape of the container before they are ever planted. If those coiled roots are not straightened or cut at planting, they continue their circular growth pattern in the ground and can evolve into girdling roots within a decade.
Soil that accumulates at the base of a tree over time, through mulching, grading changes, or lawn buildup, progressively buries the root flare and creates the same conditions as a deep planting. In some cases, a tree root barrier installed to redirect roots away from a structure can also contribute to the problem if it forces roots to curve back toward the trunk rather than outward.
The challenge with girdling roots is that the problem develops below the soil line, where it is not visible without excavation. There are several above-ground signs worth checking, however.
Look for these indicators during a ground-level inspection:
If your tree is showing any of these signs, Meyer Tree Service’s ISA-certified arborists can assess the root collar and determine whether girdling roots are involved.
Girdling roots develop slowly and invisibly, and the symptoms they eventually produce are easy to misread. A tree with a girdling root at the base may present exactly like a tree under drought stress, dealing with a pest infestation, or recovering from a nutrient deficiency. Homeowners and even general landscapers often treat the visible symptoms without examining the root collar where the actual cause is located.
By the time significant canopy decline is visible, the restriction at the base has typically been building for years. The longer girdling roots go unaddressed, the narrower the window for intervention becomes.
The standard professional treatment for girdling roots is root-collar excavation using an air spade. The air spade uses a concentrated stream of compressed air to remove soil from around the base of the tree without damaging the roots or bark, which is not possible with a shovel or mechanical excavator.
Once the root collar is exposed, a certified arborist can see the full extent of the problem, identify which roots are girdling, and selectively remove or sever the offending roots while preserving the healthy ones. In cases where the girdling root has grown into the trunk and cannot be removed cleanly, the arborist can assess the degree of restriction and recommend the appropriate next step. Meyer Tree Service’s soil decompaction and air-excavation service uses this approach for root collar work, and it is the same method the team applies when evaluating planting depth problems on trees that were set too deep at installation.
For trees that have not yet developed girdling roots, correct planting depth and proper root preparation at installation are the most effective prevention. Meyer’s tree planting and transplanting service prioritizes root flare placement on every job for exactly this reason.
Girdling roots are a problem that most homeowners cannot see, most general landscapers do not check for, and most trees cannot recover from without professional intervention. Meyer Tree Service’s ISA-certified arborists bring the diagnostic experience and the equipment to assess what is actually happening at the root collar, and to correct it before the restriction becomes permanent. If a tree on your property is declining in ways you cannot explain, reach out today to schedule a root collar evaluation.
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