Quick Answer: Girdling roots are roots that grow around or press against the base of a tree instead of spreading outward. Over time, they can squeeze the trunk or major roots and interfere with normal growth. Signs may include a buried or missing root flare, flat areas near the trunk, thinning leaves, slow growth, or branch dieback. Because cutting large roots can weaken or destabilize a mature tree, suspected girdling roots should be evaluated before any major root work is done.
What Are Girdling Roots?
Healthy roots usually spread outward from the trunk. Girdling roots grow across or around the base of the tree and can press against the trunk or other large roots.
As the tree gets bigger, both the trunk and the roots expand. A root that caused little trouble when the tree was young may begin pressing tightly against the trunk years later.
Some girdling roots are easy to see. Others are hidden under soil or mulch.
What Causes Girdling Roots?
Girdling roots often start with planting or root-growth problems.
A tree may have been planted too deep, roots may have already been circling inside a container, or soil and mulch may have been piled too high around the trunk. In those situations, roots may keep growing sideways or around the base instead of spreading away from the tree.
The problem can take years to become obvious, which is why it is often found on older trees.
What Is a Root Flare?
The root flare is the area where the trunk widens as it meets the ground. On a healthy tree, this wider base is usually visible.
If the trunk looks like a straight pole going into the soil, the root flare may be buried or restricted. That does not automatically mean the tree has girdling roots, but it is a sign worth checking.
A buried root flare can also make it harder to see roots that are growing in the wrong direction.
What Are the Signs of Girdling Roots?
The most useful clues are usually found near the base of the tree.
You may see a root crossing or wrapping around the trunk, a flat or pinched section near the base, or little to no visible root flare. The tree may also show slow growth, thinning leaves, smaller leaves, or branch dieback.
These canopy symptoms are not specific to girdling roots. Drought, root rot, pests, soil problems, and other stresses can cause similar changes. That is why the root area and the rest of the tree should be looked at together.
How Can You Tell If the Problem Is Serious?
Not every girdling root creates the same level of concern.
A small root resting against the trunk may only need to be watched. A large root that is tightly pressed into the trunk, causing a deep flat area, or affecting a major root is more concerning.
Signs that deserve closer attention include visible trunk compression, a buried root flare, canopy decline, or a large root that appears deeply embedded at the base of the tree.
The condition of the whole tree matters more than the size of one visible root.
Can Girdling Roots Kill a Tree?
They can contribute to decline, but not every tree with girdling roots will die.
The risk depends on the size and location of the root, how long it has been pressing against the tree, how much of the trunk or root system is affected, and the tree’s overall health.
A severe girdling root can restrict normal growth and add stress over time. In mature trees, the problem can be harder to correct because the roots and trunk are already large.
Can Girdling Roots Be Fixed?
Sometimes.
Small roots may be easier to correct than large roots on mature trees. In some cases, removing a girdling root may help. In others, cutting it could damage an important root or reduce the tree’s stability.
There is no one-size-fits-all fix. The decision depends on the root’s size, location, and how much the tree depends on it.
An ISA Certified Arborist can inspect the root flare, trunk, visible roots, canopy, and overall stability before recommending any work.
What Should You Avoid Doing?
Do not cut a large root just because it appears to be wrapping around the tree.
Large roots help support the tree and move water and nutrients. Cutting the wrong one can weaken the tree or create a new stability problem.
Also avoid digging aggressively around the trunk. Heavy digging can damage smaller roots and make it harder to understand what is happening below the surface.
If the root is large, tightly pressed against the trunk, or hard to expose, have it evaluated first.
Can Mulch Make the Problem Harder to See?
Yes. Too much mulch around the trunk can hide the root flare and cover roots growing in the wrong direction.
Keeping mulch away from the trunk makes it easier to see the base of the tree and notice changes over time.
If the trunk disappears straight into a mound of mulch, the base of the tree may need a closer look.
When Should You Have the Tree Checked?
Have the tree evaluated if you notice a large root wrapped around the trunk, a deep flat area near the base, a hidden root flare, or unexplained thinning in the canopy.
This is especially important with mature trees, where removing a large root without understanding its role can create more problems than it solves.
Girdling Roots in Mature Trees Around Muncie
Girdling roots can develop for years before a mature tree shows obvious stress. If a tree in Muncie has unusual roots near the trunk, a buried root flare, or unexplained canopy decline, it is worth checking the root area before any cutting is done.
The goal is not to remove every root that looks unusual. It is to determine whether the root is actually restricting the tree and whether correcting it would help or create more risk.
Frequently Asked Questions
What do girdling roots look like?
They often look like roots crossing or wrapping around the base of the trunk instead of growing outward. Some may press tightly into the trunk and create a flat or indented area.
Are girdling roots always visible?
No. Some are hidden under soil or mulch. A buried root flare or unusual shape at the base of the trunk may be a clue.
Can a tree survive with girdling roots?
Yes. Some trees live for years with them. More severe cases can contribute to decline as the tree and roots continue to grow.
Should girdling roots always be removed?
No. The size, location, and importance of the root should be considered before it is cut. Removing a large root can sometimes do more harm than leaving it in place.
Can girdling roots make a tree unstable?
They can if they affect major roots or the base of the trunk. The level of risk depends on the condition of the whole tree and root system.
Have Suspected Girdling Roots Evaluated
If you notice roots wrapped around the trunk, a buried root flare, or unexplained decline, avoid cutting large roots on your own. Josh Newsome’s Tree Surgery can evaluate mature trees in Muncie and help determine whether the roots should be monitored, corrected, or left alone.