Every summer, tree services across Perth field the same anxious phone call: “There’s something wrong with my gum tree, the bark is falling off in strips!” It is one of the most common worries gum tree owners have, and in the vast majority of cases, the answer is reassuring. Shedding bark is one of the most natural things a eucalypt does. But peeling bark can occasionally point to a genuine problem, and knowing how to tell the difference is worth understanding.
This guide explains why gum trees shed their bark, what healthy shedding looks like, and the specific warning signs that mean it is time to have your tree looked at by a professional.
Why gum trees shed bark in the first place
Australia is home to more than 700 species of eucalypt, and they fall broadly into two groups: rough-barked types like stringybarks and ironbarks that hold onto their bark, and smooth-barked “gums” that shed it. The shedding varieties are the ones that alarm people, because they drop bark in dramatic flakes, curls and long ribbons.
The reason comes down to how fast these trees grow. Eucalypts are vigorous hardwoods that lay down new sapwood on the outside of the trunk each growing season, and the trunk expands as they do. The old outer bark simply cannot keep up, so it dies and is cast off, much like a growing body outgrowing tight clothing. This shedding, known technically as decorticating, peaks in the warmer months when growth is fastest, which is exactly why the panicked phone calls cluster in summer.
Shedding bark is actually good for the tree
Far from being a sign of ill health, bark shedding benefits the tree. As the old bark peels away, it takes with it any moss, lichen, fungi and bark-dwelling insects that had set up home there, effectively giving the trunk a clean slate. In some species the freshly exposed bark underneath can even photosynthesise, contributing energy to the tree. The colourful patches of cream, yellow, orange and grey that appear on a freshly shed trunk are a hallmark of a healthy, actively growing gum.
So if your smooth-barked gum is dropping ribbons of bark in January while the canopy above stays green and full, you can relax. That is a tree doing exactly what it evolved to do.
What healthy shedding looks like
To reassure yourself, look for these signs of normal, healthy bark shed:
- The bark peels in clean strips, curls or flakes, revealing fresh, smooth bark underneath.
- The newly exposed bark is firm and often brightly coloured, not dark, sunken or oozing.
- The canopy above remains full and green, with healthy new growth.
- The shedding is happening in the warmer growing months rather than mid-winter.
- There is no foul smell, no sawdust-like frass, and no soft or hollow patches on the trunk.
The warning signs that point to a real problem
Bark loss becomes a concern when it is accompanied by other symptoms of decline, or when what is revealed underneath looks unhealthy. Watch for the following:
- Dark, sunken or oozing patches: cankers are localised dead areas on the bark, usually fungal, that can girdle a branch or trunk and cut off nutrient flow. The exposed wood looks discoloured rather than fresh.
- Bark loss with canopy dieback: if branches are dying back from the tips at the same time as bark is coming away, the tree may be suffering a systemic problem rather than a seasonal shed.
- Soft, spongy or hollow trunk sections: these can indicate internal rot, which is a structural concern as much as a health one.
- Sawdust, tunnels or holes: these point to borers working under the bark, which can seriously weaken a stressed tree.
- Sticky honeydew and sooty growth: a sign of sap-sucking pests like psyllids and their lerps, which stress the foliage.
Cankers, rots and dieback are the kind of issues that a seasonal shed will never cause, and they are worth investigating properly. Our overview of how to identify and treat common tree diseases sets out what fungal and bacterial problems look like, while a rundown of the pests that attack trees will help you recognise borer and psyllid damage before it does lasting harm.
Stress makes everything worse
The key thing to understand is that gum trees are usually attacked by disease and pests only when they are already stressed by drought, poor drainage, root damage or nutrient problems. A healthy, well-established gum shrugs off most threats. A struggling one becomes an easy target. That is why bark trouble is so often a symptom of an underlying decline rather than the cause of it. If your gum is showing several warning signs at once, it is worth learning to read the broader signals that a tree is dying so you can gauge how serious the situation really is.
When to call a professional
If the bark is shedding cleanly and the canopy is healthy, you need to do nothing but enjoy the show. But if you are seeing cankers, dieback, soft trunk sections, borer activity or a general loss of vigour, it is time to have the tree assessed. This matters even more for large gums close to a house, because a structurally compromised eucalypt can shed limbs or fail in a storm. Understanding when a tree has become dangerous and giving it some attention before storm season can prevent a much bigger problem later.
Depending on what the assessment finds, the answer might be as simple as targeted pruning to remove affected limbs and reduce stress, or in more serious cases removal of a gum tree that has become unsafe. Because gums are such an important part of our native landscape, keeping a healthy one standing is always the preferred outcome where it is possible, and understanding our native trees helps put their quirks, including all that dropped bark, in context.
Not sure about your gum tree?
AB Trees is a fully qualified and insured team based in Spearwood, servicing the Perth metropolitan area. If your gum tree’s bark has you worried, or you have spotted any of the warning signs above, contact us for an honest assessment and a free, no-obligation quote. Explore our full range of tree services to see how we can help keep your trees healthy and safe.
