Tree Bark Peeling: Normal vs Problem by Species

Peeling or flaking bark generates more concerned phone calls to cooperative extension offices than almost any other tree question, per Penn State Extension. In the majority of cases, the bark is peeling normally as part of the tree's natural growth process. In a smaller but important subset of.

Peeling or flaking bark generates more concerned phone calls to cooperative extension offices than almost any other tree question, per Penn State Extension. In the majority of cases, the bark is peeling normally as part of the tree's natural growth process. In a smaller but important subset of cases, peeling bark is a symptom of disease, pest damage, or abiotic injury requiring attention.

The diagnostic key is knowing which species naturally exfoliates, and for those that don't, recognizing the distinguishing features of problem peeling.

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Trees That Naturally Exfoliate (Normal Peeling)

Per Missouri Botanical Garden and Penn State Extension, the following species shed bark naturally as their diameter increases:

Sycamore (Platanus occidentalis) and London Planetree (P. × acerifolia)

Sycamore produces some of the most dramatic exfoliating bark in the North American landscape. The outer bark peels in large irregular patches, exposing a mottled surface of white, gray, green, and tan underlayers. Per Missouri Botanical Garden, this is entirely normal and is considered ornamentally distinctive. The bark peels because the outer layer cannot expand with the tree's growth and breaks off in plates.

River Birch (Betula nigra) and Paper Birch (Betula papyrifera)

Per NC State Extension, river birch naturally exfoliates in thin, paper-like sheets that curl away from the trunk, revealing cinnamon to salmon-colored inner bark. This is a defining ornamental feature. Peeling increases as the tree matures; on very young trees (first 2—3 years), peeling is minimal.

Paper birch (B. papyrifera) peels in white sheets. Per Penn State Extension, do not peel birch bark manually — this opens the tree to disease and removes the protective outer layer. The tree sheds what it needs to shed.

Crape Myrtle (Lagerstroemia indica)

Per NC State Extension, crape myrtle exfoliates in thin smooth strips on mature trunks, exposing a mottled tan-gray-pink under-bark. The peeling is year-round and increases with age. This is a normal, valued ornamental feature. Crape myrtle with healthy bark peeling and no lesions or sunken areas is not diseased.

Paperbark Maple (Acer griseum)

Paperbark maple (Acer griseum) is specifically cultivated for its peeling, cinnamon-colored bark. Per Missouri Botanical Garden, USDA zones 4—8; the exfoliating bark is the defining ornamental feature and occurs across the trunk and larger branches.

Shagbark Hickory (Carya ovata)

Per NC State Extension, shagbark hickory develops long, loose, shaggy strips of gray bark that peel from both ends but remain attached in the middle. This is normal and increases with age — old specimens can have spectacular shaggy trunks. No intervention needed.

Stewartia (Stewartia spp.)

Stewartia (S. pseudocamellia and others) develops a multi-colored exfoliating bark — gray, orange, and cream — as it matures. Per Missouri Botanical Garden, it is among the finest four-season ornamental trees, and the peeling bark is a primary winter ornament.

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