Tree girdling is the removal of a ring of bark around a trunk or branch. It cuts off the tree’s food supply to the roots. Done fully around the trunk, it kills the tree over time. Done partially or by accident, it can weaken a tree instead. Arborists use it on purpose to remove unwanted trees, and thin crowded stands. Sometimes, it is done to boost fruit size on peach and nectarine trees.
What Does Girdling Do to a Tree?
A tree moves water and minerals upward through its wood. It moves sugars downward through phloem. It is a thin layer just under the bark. Girdling cuts through the bark, the phloem, and the cambium layer that is present between bark and wood.
Once that ring is cut, sugar made in the leaves can no longer reach the roots. The roots keep using stored sugar until it runs out. Then they starve and die. A tree can survive for months looking healthy after girdling. But it dies the following year once its root reserves are gone.
This is different from just cutting a tree down. A cut stump still has live roots underneath. Those roots often push up new sprouts. A girdled tree, by contrast, dies at the roots. It does not grow back.
Girdling depth matters too. Removing only the phloem and cambium works differently than cutting deep enough to sever the wood underneath. A shallow ring starves the roots slowly, over months or years. A deeper cut that reaches the wood affects water movement right away. In this case, the tree can wilt within days.
How Do You Girdle a Tree?
The basic method is simple. Cut two parallel lines around the trunk, a few inches apart. Then remove the bark and cambium between the cuts.
A few points make the difference between a girdle that works and one the tree heals over.
Go All the Way Around
Every part of the ring needs to connect. Skip even a small strip of bark, and the tree can use it to keep feeding the roots. In tight spots, like between a fence and a wall, a wire saw can reach where a chainsaw can’t.
Cut a Wide Enough Band
A thin slice heals fast. Bark can grow back across a narrow cut within a season. This lets the tree survive. Take out a band at least two inches wide to stop that from happening.
Scrape the Wood After Peeling the Bark
A thin layer of living cambium cells can remain on the wood after you peel the bark away. On a healthy, moist trunk, those cells sometimes regrow bark right over the wound. Scraping the exposed wood with a knife disrupts what’s left. It stops that regrowth.
Remove Any Growth Below the Ring
Leaves or shoots still attached below the girdle keep feeding the roots. This can keep the tree alive. Check the trunk base and the ground nearby for root sprouts. They can pop up several feet from the tree itself.
Cut Every Stem on Multi-Trunked Trees
A tree with several stems from one root system needs every single stem girdled. One healthy trunk left alone can keep the whole root system alive.
For Commercial Girdling Work
Loggers and forestry crews need to girdle large numbers of trees at once. A chainsaw held at waist height can cut through bark in one pass. The expert does this walking around the trunk. But a cut alone isn’t enough. The cambium layer can regrow across a plain chainsaw cut. Thus, many crews follow up with an approved herbicide. They apply it directly to the wound for a complete kill.
What Is the Best Time of Year to Girdle a Tree?
Spring and early summer give the best results. In April, a tree buds out. The bark enters a stage where it separates easily from the wood underneath. This is called the bark being loose. That loose stage lasts through early summer.
Around the first of June sits in the middle of that window. Cutting six weeks on either side of that date still works about as well. During this stretch, bark practically peels off with light prying. Thus, the job takes less time and less effort than at any other time.
Trying to girdle a dormant tree is a different job entirely. When the bark tightens back up for winter, you have to cut down through the bark and into the wood itself. This is far more work.
Timing also affects how well the girdle kills the tree. A tree that has just spent its stored energy growing new leaves and shoots has little left in reserve. Cutting off its food supply at that point hits harder.
Forestry crews working on a different schedule get results too. Trees girdled in autumn or winter typically still leaf out the following spring. After that, the lack of food reaches the roots. The tree begins to decline after that.
For fruit tree girdling, the calendar runs on a separate schedule. It is tied to harvest, not dormancy. Growers girdle peach and nectarine branches to increase fruit size. They don’t do it to kill the tree. This type of girdling is generally done four to eight weeks before harvest. It is timed to land before the fruit pit hardens in spring. Girdling is done only on branches at least two inches thick, on trees four years or older. Younger or thinner wood cannot handle the cut.
What Tools Are Used for Girdling?
Girdling demands the following tools:
- Chainsaw: It is the fastest option for cutting the two parallel lines through bark on a mature tree. A sharp chisel-type tool still has to follow behind. It strips the bark between the cuts.
- Hand saw: It works the same way as a chainsaw, just slower. Useful on smaller trees or in areas where a chainsaw is impractical.
- Axe: An axe can girdle a tree through a method called double hacking. This means chopping one line around the trunk. Then a second line about three inches above it. After that, wood is pried out in between with the ax blade.
- Girdling knife: A specialized blade used mainly in fruit production. It is built to remove a thin, precise strip of bark without digging into the wood.
- Wire or cable saw: Cuts through bark only, not wood. It fits into tight spaces where a chainsaw or hand saw can’t reach.
- Screwdriver or pry bar: It is used after the cuts are made. It peels the loosened bark ring away from the trunk.
Experts pair herbicide with hand tools. A technique called frilling applies herbicide directly to a single ring of ax cuts. This is because a single line of narrow cuts seldom works without herbicide to fully stop the tree.
Time and cost on a bigger job depend on more than the tool. Tree species, average trunk diameter, tree density, bark thickness, how much limbing is required, and terrain all factor into how long a girdling job takes. It also impacts its cost.
What Are the Benefits of Girdling Trees?
Girdling offers these benefits:
It clears crowded stands without heavy equipment
Removing a tree by cutting it down means dragging out equipment. It can sometimes damage trees nearby. Girdling lets a single person thin a woodland with just a chainsaw and some herbicide. They can work at a pace of a couple of light days per year.
It protects nearby trees from sudden light and wind exposure
Cutting a tree down all at once opens a sudden gap in the canopy. It exposes neighboring trees to a wind and sun change they weren’t ready for. Girdling spreads that change over several years as the tree slowly dies. It gives neighboring crowns time to grow into the space.
It builds wildlife habitat
A dying, girdled tree becomes a rich habitat for insects and fungi. Woodpeckers and other wildlife also follow. Because the roots stay anchored for years after the tree dies, there’s little risk of the tree toppling suddenly.
It avoids the endless resprout cycle
Cutting down a live tree with strong roots triggers new growth from the stump or roots. Girdling instead kills the roots directly. There’s nothing left to send up new shoots.
It increases fruit size on select fruit trees
On peach and nectarine trees specifically, girdling can produce bigger fruit. It can also produce a heavier crop per tree. Girdling can also begin a harvest that starts roughly ten days earlier.
It skips herbicide entirely, if you let it work slowly
Waiting for a girdled tree to die naturally takes minimal equipment. There’s no need for chemicals at all, compared to cutting a tree down.
Girdling isn’t the right call everywhere, though. It tends not to suit large commercial woodlands, or areas planned for clear-felling and coppicing. The extra light in those settings can push a girdled tree to sprout new growth from its base instead of dying. It also isn’t a good fit near homes or walkways. A standing dead tree still has to come down eventually. Dead wood is far less predictable to fell than live wood.
When Girdling Isn’t the Right Call, Call Knock On Wood
Girdling has its place on a farm, a managed woodland, or a fruit orchard. Most residential yards in Franklin and Williamson County call for something different. A dying, standing tree near a house, driveway, or power line is a liability, not a habitat feature. If a tree is dead, dying, storm-damaged, or simply in the wrong spot, safe removal is almost always the better route for a home or business property.
Knock On Wood Tree Services has handled tree removal, pruning, and plant health care across Franklin and Brentwood since 2015. If you’re weighing your options for a struggling tree on your property, contact us for a free estimate. We’ll help you figure out whether removal, trimming, or a health treatment plan makes the most sense.
FAQs
What is girdling in plants?
Girdling is removing a ring of bark, cambium, and sometimes wood from around a stem or trunk. It blocks the downward flow of sugar from leaves to roots. The roots eventually starve and die. It kills the plant from the ground up, even though the top may look fine at first.
What is root girdling?
Root girdling happens when a root wraps around the trunk or another root and squeezes it as both grow thicker. It’s common in container-grown trees planted without loosening the roots first. Left alone, it slowly strangles the trunk and can weaken or kill the tree over several years.
How does girdling kill a tree?
Girdling cuts the phloem layer that carries sugar from leaves down to roots. Roots run out of stored sugar and die from starvation, not thirst. Once the roots are dead, they can no longer supply water or hold the tree upright, so the crown dies as well.