Some trees have bark that appears to 'peel' because they renew their bark to get rid of parasites, diseases, or to promote the growth of new tissues. This process is called bark exfoliation.
Trees, somewhat like human skin, regularly replace the protective outer layer of their trunk. This phenomenon is called exfoliation: it’s what gives the impression that the bark is peeling off in plates or scales. Essentially, the outer parts that have become old or dead give way to new bark underneath. Trees do this naturally as they grow, expand, or to get rid of pests or fungi. It may seem strange, but it is completely normal and even essential for the health of certain tree species.
Beneath the bark of trees, there is a living layer called the cambium. It produces new cells outward, gradually forming the layers of the bark. As they grow, these new cells push the older ones outward. These older cells eventually die, dry out, detach, and fall off naturally, much like your skin after a sunburn. This process ensures that the tree undergoes constant renewal, eliminating pests and helping to get rid of damaged parts. The peeling bark thus plays a true role in self-cleaning. Some species have rapid trunk growth, which particularly promotes this peeling effect.
Among the trees with peeling bark, the paper birch stands out, easily recognizable by its white bark that peels off in thin layers like rolled paper. The plane tree, found all over the city, displays a rather original patchy pattern with colors ranging from gray to light green: its old bark comes off in large irregular plates, revealing the new skin underneath. As for the strawberry tree, also known as the "strawberry tree," it gradually loses parts of its brown bark in thin strips, slowly revealing a very bright reddish-orange color. Another interesting specimen, the rainbow eucalyptus is renowned for its astonishing multicolored vertical stripes revealed as its bark exfoliates: a true living painting! The red pine, also called Scots pine, sheds its bark in small scales or fine reddish plates, producing contrasting and more rustic patterns.
The fact that a tree sheds its bark in pieces provides several ecological advantages. First, this exfoliation allows the tree to rid itself of damaged or infested layers by parasites. It acts like a natural renewal of its protection, a sort of regular "cleaning."
By dropping its bark, the tree also prevents the permanent establishment of organisms like mosses, lichens, or other highly invasive climbing plants. This helps to limit direct competition on its trunk for access to light or nutrients.
Finally, these pieces of bark on the ground decompose slowly, enriching the soil and improving its quality, indirectly benefiting the surrounding plants. They even provide a useful habitat for many small creatures (insects, spiders), thus increasing local biodiversity.
Some external factors promote or amplify the phenomenon of bark peeling in trees. For example, a significant temperature variation can cause the bark to detach further because it forces the tree to manage frequent thermal stress. Significant exposure to intense sunlight can also play a role: direct heat weakens the outer bark, which eventually begins to crack and peel away. Similarly, ambient humidity, especially when it changes rapidly, causes the bark to swell and then dry out quickly, thus promoting its exfoliation. Extreme weather conditions, such as regular strong winds or frequent periods of drought, exacerbate this phenomenon by constantly putting the bark under stress.
The arbutus, or strawberry tree, derives its picturesque charm from its peeling bark, which reveals trunks with intense orange hues, renowned in landscaping for their exceptional aesthetic appeal.
The bright color visible on the freshly exposed bark after exfoliation serves, in some species, as a protective technique against excessive sunlight through its photoprotective pigments.
The paper birch gets its name from its characteristic peeling bark, which was once used by Native Americans in North America to create canoes as well as water-resistant shelters.
The bark of plane trees naturally exfoliates in irregular patches, allowing them to better dispose of accumulated pollutants, making them a species well-suited to urban environments.
Among the trees commonly observed with peeling bark are birches, the common plane tree, certain eucalyptus species, and several maple species such as the paperbark maple.
It is preferable to let the bark exfoliate naturally. Removing the bark manually could harm the tree and expose it to infections or pests. Therefore, it is recommended to avoid any unnecessary intervention.
The bark of a healthy tree that naturally peels reveals a clean, intact layer underneath, often colorful or shiny. Diseased bark peels irregularly, exposing damaged, dark, or damp areas, and may be accompanied by deep cracks or visible pests.
No, in general, the exfoliation of bark is a natural process in certain trees. It often indicates that the tree is healthy and regularly renews its outer protective layer.
Winter often enhances natural exfoliation due to frequent temperature variations that cause the bark to expand and contract, thereby facilitating the detachment of the outer layers.
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