Trees are one of the most valuable features on any property. They provide shade, improve curb appeal, create habitat for wildlife, reduce heat around the home, and can even increase property value. But trees are living organisms, and like any living thing, they can experience stress, disease, injury, and decline over time.
The challenge for many property owners is that trees rarely die overnight. In most cases, a tree shows warning signs well before it reaches the point of no return. The difficulty is recognising those symptoms early enough to act.
A tree with thinning leaves, dead branches, or unusual growth patterns does not necessarily require removal. Some problems can be corrected if identified early. Others may indicate serious structural issues that require immediate professional attention. Research and arboriculture sources consistently indicate that symptoms such as crown dieback, fungal growth, bark loss, and root damage often precede complete failure.
If you are wondering whether your tree is declining, here are the major signs to watch for, the common causes behind them, and what you may be able to do to help save it.
Common signs that your tree may be dying
1. Dead branches in the upper canopy
One of the earliest warning signs of a struggling tree is dieback at the top of the canopy.
If you notice branches in the upper section becoming leafless while the rest of the tree still has foliage, the tree could be experiencing stress below ground. This often indicates that water or nutrients are no longer reaching the upper sections properly.
Things to look for include:
- Bare branches among healthy foliage
- Dead twigs dropping regularly
- Branches becoming brittle
- Large sections of the crown appearing sparse
While some deadwood can be normal as trees age, widespread dieback is usually a concern.
2. Leaves changing colour too early
Leaves provide valuable clues about overall tree health.
Watch for:
- Yellow leaves outside seasonal changes
- Brown leaf edges
- Small or misshapen leaves
- Leaves falling prematurely
- Uneven colour throughout the canopy
Trees often show stress through foliage before other symptoms become visible. Heat stress, poor nutrition, root damage, and disease can all affect leaf colour and growth.
3. Bark falling away
Healthy bark acts as a protective layer for the tree.
If you notice:
- Large pieces of bark peeling off
- Missing sections of bark
- Deep cracks
- Vertical splits
the tree could be dealing with decay, disease, or internal damage.
Some tree species naturally shed bark, so context matters. However, significant bark loss combined with other symptoms should not be ignored.
4. Fungal growth near the trunk or roots
Mushrooms growing around the base of a tree can sometimes be harmless, but they may also indicate internal decay.
Particular concern arises if you see:
- Shelf-like fungi attached to the trunk
- Large fungal clusters around roots
- Recurring mushrooms in the same area
Fungi often feed on decaying wood. By the time visible fungal structures appear, internal deterioration may already be advanced.
5. The tree suddenly leans
Some trees naturally grow at an angle.
However, if a tree suddenly begins leaning or you notice raised soil around the base, this may suggest root failure.
Watch for:
- Cracked soil
- Exposed roots
- Movement after storms
- New leaning patterns
This can quickly become a safety issue, especially if the tree is close to structures, fences, driveways, or footpaths.
6. Excessive insect activity
Not all insects harm trees.
However, certain insects attack weakened or stressed trees, including borers and wood-damaging pests.
Potential warning signs include:
- Small holes in bark
- Fine sawdust near the trunk
- Sap leaking from holes
- Large concentrations of insects
In many cases, insect activity is a symptom rather than the original cause of decline. Trees weakened by drought or disease often become vulnerable to infestations.
7. No green under the bark
Arborists sometimes use a simple scratch test.
Gently scrape a very small section of outer bark.
Healthy tissue underneath is usually:
- Green
- Moist
- Flexible
Dead tissue often appears:
- Brown
- Dry
- Brittle
If several sections around the tree show no green tissue, serious decline may be occurring.
What causes trees to die?
Tree decline rarely has one single cause. Often, several factors combine over time.
Drought and heat stress
Australian conditions can be harsh on trees.
Long dry periods may reduce:
- Water uptake
- Nutrient movement
- Root function
Trees experiencing prolonged moisture stress often begin declining gradually. Heat stress is commonly identified as a major contributor to tree problems.
Root damage
Many homeowners focus on what they can see above ground, but roots are often where problems begin.
Root systems may be damaged by:
- Construction work
- Excavation
- Driveways
- Foot traffic
- Soil compaction
- Changes in ground levels
When roots become compromised, the tree struggles to absorb moisture and nutrients.
Poor watering habits
Both underwatering and overwatering can create problems.
Too little water:
- Causes stress
- Reduces growth
- Weakens natural defences
Too much water:
- Suffocates roots
- Encourages root rot
- Promotes fungal diseases
Trees need consistent moisture rather than irregular flooding.
Disease and fungal infections
Numerous diseases affect trees across Australia.
Some attack:
- Leaves
- Roots
- Bark
- Internal wood structures
Once diseases establish themselves, they can spread quickly if left untreated.
Pest infestations
Borers, beetles, and other insects may attack stressed trees.
Healthy trees often defend themselves naturally, but weakened trees become vulnerable.
Physical damage
Storms, machinery, vehicles, poor pruning practices, and accidental injuries can all compromise tree health.
Wounds provide entry points for disease and pests.
Can a dying tree be saved?
Sometimes yes.
The earlier the issue is identified, the better the chance of recovery.
Possible solutions may include:
Correct watering practices
Deep watering during dry periods can help trees recover.
Watering should generally:
- Reach the root zone
- Be slow and thorough
- Avoid waterlogging
Mulching
Mulch helps:
- Retain soil moisture
- Reduce temperature fluctuations
- Improve soil conditions
- Reduce weed competition
Keep mulch away from direct contact with the trunk.
Pruning dead branches
Removing damaged or diseased branches can:
- Reduce stress
- Improve airflow
- Encourage healthy growth
However, excessive pruning can create additional stress.
Soil improvement
Compacted or nutrient-poor soil may require:
- Aeration
- Organic matter
- Fertiliser where appropriate
Professional assessment
Some issues simply cannot be diagnosed from a quick visual inspection.
Arborists can assess:
- Structural stability
- Root health
- Disease presence
- Internal decay
- Safety risks
Community discussions among arborists frequently point out that severe crown dieback, major trunk decay, or widespread fungal activity often indicates advanced decline where treatment options become limited.
When tree removal becomes the safest option
Not every tree can be saved.
Removal may become necessary when:
- More than half the canopy has died
- Significant root failure exists
- Large trunk cavities develop
- Severe leaning appears
- Extensive decay affects structural integrity
Dead or unstable trees can become serious hazards, particularly during storms or strong winds.
Final thoughts
Trees often give plenty of warning before they fail completely. Yellowing leaves, dead branches, fungal growth, peeling bark, and sudden leaning are all signals worth paying attention to.
The key is early action.
A stressed tree does not automatically mean a lost tree. Sometimes, a simple adjustment to watering, pruning, or soil conditions can improve health dramatically. But if symptoms continue worsening or structural concerns appear, obtaining a professional assessment becomes important.
The longer serious issues remain untreated, the fewer options may be available. Identifying the problem early gives your tree the best chance of recovery and helps keep your property safe and attractive for years to come.
Need Help With a Neighbouring Tree in Perth?
If you are dealing with overhanging branches, encroaching roots, or a tree next door that is causing damage or raising safety concerns, the team at AB Trees is here to help. We provide honest, professional advice, free no-obligation quotes, and a service you can trust.
Call Ben on 0424 150 899 or get in touch through our website at abtrees.com.au to book your free assessment today. We service the entire Perth metropolitan area, north and south of the river, and no job is too big or too small.
