Removing a complete ring of bark from around a tree’s trunk will, in most cases, kill the tree. The lethal damage comes not from losing the rough outer layer you can touch, but from destroying the thin living tissue just beneath it, which carries sugars from the leaves down to the roots. How quickly death follows, whether a tree can recover, and the handful of species that have evolved to survive bark removal all depend on details that matter if you are dealing with storm damage, animal activity, or deliberate management of a tree on your property.
What Bark Actually Does
When people say “bark,” they usually mean everything visible on the outside of a trunk. But that outer crust is mostly dead cork cells whose job is physical protection. The critical tissue sits just inside: a paper-thin layer called the phloem, which acts as the tree’s food-delivery pipeline. Sugars produced in the leaves travel downward through the phloem to feed the roots and lower trunk. Sandwiched between the phloem and the wood is the cambium, a band of actively dividing cells responsible for producing new wood on one side and new phloem on the other. When bark is stripped off carelessly, both the phloem and cambium usually go with it.
Hormones also play a role in keeping the cambium healthy. In poplars, for example, the balance between cytokinin and auxin in the cambial zone directly regulates how the cambium grows and divides. Disrupting the tissue that produces or transports these hormones stalls the tree’s ability to add new wood or new phloem.1PubMed Central. PagIPT5 Mediates Cambial Development in Poplar via Cytokinin–Auxin Crosstalk Think of the cambium as a factory that builds the tree outward year after year. Destroy the factory, and growth stops permanently in that section of the trunk.
Why Complete Bark Removal Is Usually Fatal
The term for removing a full ring of bark around a trunk is “girdling,” and it is one of the oldest known ways to kill a standing tree. What makes it lethal is simple: roots need a constant supply of sugar from the canopy, and the phloem is the only route that supply can take. Once a complete girdle severs every phloem pathway, sugar accumulates above the wound and the roots begin to starve.
Research on citrus trees showed that girdling caused a sharp drop in both soluble sugar and starch concentrations in the roots, while those same compounds built up above the girdle.2PubMed Central. Girdling affects carbohydrate-related gene expression in leaves, bark and roots of alternate-bearing citrus trees The roots do not die instantly. They live on stored reserves for weeks or months, sometimes even into the next growing season, depending on the species and the time of year. But once those reserves are exhausted, the roots can no longer absorb water or minerals, and the canopy wilts and dies from the top down.
A study on Scots pine found that trees girdled during the growing season showed no cambial reactivation below the girdle the following year. Above the wound, the cambium did start dividing again, but it was delayed and slower than in ungirdled control trees. The girdled pines also produced fewer phloem cells overall. Eventually, those girdled trees died.3Silva Fennica. The effect of stem girdling on xylem and phloem formation in Scots pine The timeline from girdling to death varies, but the direction is consistent: once the roots are fully cut off from food, the tree cannot sustain itself.
Partial Bark Loss Is a Different Story
A complete ring of missing bark is fatal, but partial bark loss, even dramatic-looking wounds, does not necessarily doom a tree. If even a narrow strip of intact bark connects the canopy to the roots, sugars can still flow downward through that remaining phloem. The tree will be weakened, and the exposed wood faces a higher risk of decay and insect attack, but the tree can survive.
Data from Illinois on wound closure found that a tree’s ability to seal over a wound is directly linked to its overall vigor. Wounds less than about 12 millimeters wide tend to close within a single year. Even annually inflicted wounds up to around 25 millimeters in diameter did not significantly slow overall tree growth.4Arboriculture & Urban Forestry. Tree Wound Closure Trees do not heal wounds the way animals do; they cannot regenerate lost tissue. Instead, they wall off the damage and grow new wood and bark around the wound’s edges until the exposed area is covered. A healthy, vigorously growing tree can close even substantial wounds over several years.
The practical upshot: if a lawnmower nicks a tree, a branch tears off during a storm, or an animal strips a patch of bark from one side, the tree will usually survive as long as the damage does not go all the way around the trunk. The wider the wound relative to the trunk’s circumference, the longer it takes to seal and the more vulnerable the tree is in the meantime.
When Animals Strip the Bark
Wildlife bark damage is one of the most common ways trees lose bark in nature. Deer, elk, porcupines, squirrels, bears, and rabbits all strip bark for food, mineral intake, or antler maintenance. The severity depends on the species doing the damage and the size of the tree.
Research on red deer bark stripping in Austria found that certain tree species are far more vulnerable than others. Norway spruce, European ash, sweet chestnut, and mountain ash had roughly 11 to 12 times more bark injuries than all other species surveyed. Red deer preferred the smallest trees, with damage probability highest at a trunk diameter of about 5 centimeters and dropping sharply once trees exceeded 25 centimeters across.5Silva Fennica. Probability of bark stripping damage by red deer (Cervus elaphus) in Austria Young, thin-barked trees are at the greatest risk because a single feeding visit can strip bark around most or all of the trunk, creating a lethal or near-lethal girdle.
For homeowners, the most frequent culprits are rabbits and rodents chewing bark near the base during winter, when other food is scarce. Wrapping the lower trunk with hardware cloth or a plastic tree guard during dormant months is the standard preventive measure. If you discover bark damage in spring, assess how much of the trunk’s circumference is gone. A wound covering less than about a quarter of the circumference is cosmetic. A wound covering more than half is serious. A wound going all the way around is probably fatal.
The Cork Oak Exception
Cork oaks are the famous outlier. The cork industry has harvested bark from living trees for centuries, and the trees survive because the process is designed to remove only the outer cork layer without damaging the phloem or cambium underneath. Workers cut along the trunk with an axe during the period when the cork cambium is actively growing, making it relatively easy to peel away large cork planks at the right layer.6PubMed Central. Cork Oak Vulnerability to Fire: The Role of Bark Harvesting, Tree Characteristics and Abiotic Factors
Even so, the process is not painless for the tree. Immediately after stripping, the exposed trunk loses water rapidly, and the tree’s stomata close within hours, halting normal gas exchange and photosynthesis. It takes roughly 24 to 30 days for a new protective cork layer to form and for the tree to resume normal function. During that recovery window, the tree burns through a large share of its stored energy reserves, and wood growth pauses entirely. Mechanical damage to the inner bark or cambium during harvesting, even minor accidental nicks, can reduce the tree’s long-term vigor.6PubMed Central. Cork Oak Vulnerability to Fire: The Role of Bark Harvesting, Tree Characteristics and Abiotic Factors Cork oaks can withstand repeated harvests over lifespans of 150 years or more, but only because harvesters are specifically targeting the expendable outer cork and leaving the vital inner tissues intact. Rip through the cambium, and a cork oak will struggle just like any other tree.
Can a Girdled Tree Ever Recover?
The answer is yes, sometimes, though researchers are still piecing together exactly when and why. Under favorable conditions, some trees can regenerate new bark even after a complete girdle. The key appears to be that living cells in the exposed wood surface, specifically wood parenchyma cells, can temporarily take over some of the phloem’s nutrient-transport duties. More remarkably, both immature xylem and phloem cells near the wound can dedifferentiate, essentially reverting to an embryonic state and then redeveloping into new vascular tissue.7IAWA Journal. Differentiation of Secondary Xylem After Girdling
This recovery is not guaranteed and seems to depend heavily on species, season, and growing conditions. A tree girdled during its most active growth period, when cambial cells are dividing rapidly, may have a better shot at bridging the gap before root starvation becomes irreversible. But for most trees under most circumstances, a complete girdle that exposes the wood all the way around is a death sentence. If you find a tree with complete bark removal and are hoping to save it, the best realistic option is to keep the tree watered and undisturbed so it can devote maximum energy toward any possible regeneration, though expectations should be low.
Bark Thickness and Fire Survival
Fire is another major cause of bark loss, and here bark thickness becomes the dominant factor in whether a tree lives or dies. During a ground-level fire, heat radiates into the trunk. The bark’s job is to insulate the cambium long enough for the fire to pass without pushing internal temperatures to lethal levels. Research across multiple studies and continents consistently finds that bark thickness is the single best predictor of whether a tree survives a fire.8Fire Ecology. Bark traits and their influence on thermal resistance to wildfires: an experimental study across six tree species common in Central Europe
In tropical savannas in northern Australia, bark thickness accounted for about two-thirds of the variation in how hot the cambium got during experimental fires, outperforming both bark moisture and bark density as a predictor. The time needed for lethal heat to reach the cambium scales with the square of bark thickness, so even modest increases in bark depth provide disproportionately more protection.9Plant Ecology. Bark thickness determines fire resistance of selected tree species from fire-prone tropical savanna in north Australia A study comparing ten Central Alpine tree species confirmed the strong overall relationship between bark thickness and cambial temperature response, while also noting that bark density plays a secondary role.10Forest Ecology and Management. Bark insulation: Ten Central Alpine tree species compared
This is why thick-barked species like ponderosa pine and longleaf pine can walk away from low-intensity fires that kill thinner-barked neighbors. When fire does burn through the bark on one side of a trunk, the result is a partial wound, a “fire scar,” that the tree can often survive and eventually close over. But if fire burns hot enough to destroy bark all the way around, the girdling effect kicks in, and the tree faces the same starvation process described above.
Bark Diversity Across Species
Not all bark is built the same, and those differences reflect evolutionary tradeoffs between protection, storage, structural support, and even photosynthesis. A broad survey of bark traits across 90 tree species from widely different environments found that thicker bark contributed to stiffer stems and greater water storage, while bark density, water content, and mechanical properties were strongly linked to the equivalent traits in the tree’s wood.11New Phytologist. Bark functional ecology: evidence for tradeoffs, functional coordination, and environment producing bark diversity In other words, a tree’s bark tends to mirror its wood: dense wood, dense bark; spongy wood, spongy bark.
Some species invest in thick, fire-resistant bark at the cost of slower growth. Others keep bark thin and allocate more energy to height growth, racing above the fire line instead. A few species, particularly in dry or fire-prone environments, hedge their bets with bark that can photosynthesize. Researchers studying Eucalyptus found that bark photosynthesis contributed roughly 11 percent of the wood dry matter produced in branches, a meaningful supplement that could help the tree recover carbon lost to damage.12PubMed Central. Stable Isotopes Reveal the Contribution of Corticular Photosynthesis to Growth in Branches of Eucalyptus miniata Green-barked species like Palo Verde take this much further, relying on bark photosynthesis as a primary carbon source during leafless periods.
Deliberate Girdling in Forest Management
Girdling is not always accidental. Foresters and wildlife managers intentionally girdle trees for a variety of reasons: to thin a stand without felling timber, to create standing dead trees (snags) for cavity-nesting birds and bats, or to reduce competition around high-value crop trees. A girdled tree dies slowly over one to several years, and during that decline it develops loose bark, cracks, and cavities that become prime habitat for wildlife. Forest managers working to benefit bat species, for instance, use girdling to create the kind of crevice and cavity roost structures that bats favor.13Forests. Tree Girdling for Potential Bat Roost Creation in Northwestern West Virginia
The slow death is actually the point. A chainsaw felling creates firewood and an immediate gap in the canopy, but it leaves no standing habitat. A girdled tree continues to provide shade and structure for years as it transitions from living tree to snag to eventual stump. In some urban and suburban contexts, girdling is used to kill unwanted trees where felling would be dangerous or impractical, like large trees near power lines. The tree dies in place and can be removed in stages once it has dried out and become lighter.
What to Do If Your Tree Has Lost Bark
If you are staring at a tree with missing bark, the first question is how far around the trunk the damage extends. A wound covering less than about a third of the circumference is usually survivable without intervention, especially on a vigorous, healthy tree. Keep the tree watered during dry periods, avoid further wounding (keep mowers and string trimmers away), and let the tree’s own closure process work.
For wounds covering more than half the circumference, the prognosis depends on the species and the tree’s general health. Thin-barked ornamental trees like birch or cherry handle large wounds poorly. Thick-barked species like oak or hickory tolerate more damage. If the wound goes all the way around, even a narrow complete girdle, the outlook is grim. You can try keeping the tree healthy and watered in hopes that the cambium bridges the gap, but plan for removal.
One older practice you might encounter is “bridge grafting,” where someone inserts small branch segments across the wound to reconnect the phloem above and below. This technique can work on fruit trees and is still recommended by some extension services, but it requires grafting skill and needs to be done in early spring before bud break to have the best chance of success. For most homeowners dealing with a badly girdled shade tree, the more realistic path is monitoring the canopy for dieback and planning for eventual replacement.
Avoid painting wounds with tar or sealant. This was standard advice for decades, but research has consistently shown that wound dressings do not speed closure and can actually trap moisture against the wood, encouraging the very decay organisms you are trying to keep out. A clean, dry, exposed wound heals faster than a painted one.