Some trees shed their bark as a feature of mature growth. The homeowner who doesn’t know that calls in a panic. Paul on identifying normal vs. concerning.
One of the more common arborist calls is the homeowner who walks out one morning and sees bark falling off a tree they thought was healthy. Panic is a reasonable first reaction. The right next step is identification — because for at least one common South Jersey species, bark exfoliation is not a disease symptom. It’s a feature of mature growth.
View from the Field · Paul Biester · Tree Awareness
“Just had a client visit with a client who thought they had a sick tree — there was some bark peeling off the plant. In this case the peeling bark happened to be a Zelkova tree, and it happened to be an actual bark feature. As certain plants mature they present a more mature bark feature, and in this case the Zelkova does begin to exfoliate its bark. The main reason of this video is to just let you know that he felt bad having me come out, and it was nothing. Never feel bad if you have a tree that you are not sure about and you want an arborist to come out and take a look at it. We would much rather catch an issue while we can still intervene and change the course of the plant’s life for the better, than you call us a couple years too late and there’s nothing we can do.”Paul Biester · NJ LTE #408
Japanese Zelkova (Zelkova serrata) is one of the more popular medium-large shade trees in residential and street-tree plantings across South Jersey. It’s often planted as a substitute for American Elm in the post-Dutch-Elm-Disease era because its branching architecture is similar, its mature size is appropriate for residential lots, and it tolerates a wide range of soils and conditions. You see Zelkovas all over Gloucester, Camden, Salem, and Cumberland counties.
The species develops a distinctive bark feature as it matures. Young Zelkova bark is smooth and gray, similar to American Beech. As the tree reaches roughly 20+ years of age, the outer bark begins to exfoliate in irregular plates, revealing patches of cinnamon-orange inner bark underneath. The mature bark texture is genuinely striking — one of the more visually interesting bark patterns in the regional canopy. To a homeowner who’s never seen it before, it looks exactly like a tree dying.
It isn’t. The tree is doing what Zelkovas do.
Zelkova isn’t alone in this. Several common landscape species develop dramatic bark exfoliation as a normal feature of mature growth, and any of them can produce the same panic call.
If your “sick tree” matches any of these descriptions, it’s probably a feature, not a problem. An arborist visit can confirm in one minute.
Three things distinguish a healthy bark feature from an actual problem:
The pattern. Normal exfoliation is uniform across the trunk — the whole tree is shedding similarly. Disease-driven bark loss is usually localized to one area, around a wound site or following a vascular pathway.
What’s underneath. Healthy exfoliation reveals fresh, smooth, well-formed inner bark in characteristic species colors. Disease-driven bark loss reveals dark, mushy, or cracked tissue, often with visible decay or insect damage.
The canopy. A tree that’s exfoliating normally has a fully healthy canopy — full leaf, normal color, no dieback. A tree losing bark to disease typically shows canopy symptoms (dieback, yellowing, sparse leaves) along with the bark loss.
The arboricultural identification is almost incidental to the actual message of this video. The homeowner felt bad about having Paul come out for what turned out to be nothing. Paul’s response is the part worth printing on a card and putting in the truck:
“Never feel bad if you have a tree that you are not sure about and you want an arborist to come out and take a look at it. We would much rather catch an issue while we can still intervene than have you call us a couple years too late.”Paul Biester · NJ LTE #408
Most of the trees Tree Awareness ends up removing got to that point because someone waited too long to call an arborist. The trees we save — the ones we put on a Plant Health Care plan or correct with structural pruning — got that intervention because someone was uncertain enough to make the call. Either outcome on the diagnosis (it’s nothing / it’s something) is fine. The wrong outcome is the one where you didn’t call.
Tree care lives in the gap between knowing your trees and not knowing them. Most homeowners can’t identify the species in their own yard, can’t name the diseases that threaten them, can’t distinguish a healthy bark feature from a symptomatic one. That’s fine. That’s why arborists exist. The professional value isn’t just doing the work — it’s answering the “is this normal?” question with confidence so the homeowner doesn’t spend three years worrying about a tree that’s just being itself.
For a no-pressure species and condition walk-through on the trees on your property, request a consulting arborist visit →
