Keeping your trees healthy and safe isn’t just about appearances—it’s about protecting your property, family, and neighbours. In Perth, trees face a unique set of challenges: scorching summers that can stress roots, winter storms that can bring down limbs, and sandy soils that can compromise stability. Over time, branches grow over pathways, roofs, and driveways, while hidden decay or poor structure can turn a beautiful tree into a safety hazard.
Trimming isn’t just cosmetic. The right pruning prevents accidents, improves air circulation, and supports long-term tree health. From overgrown branches brushing your roof to deadwood ready to snap in the next strong breeze, knowing what to look for can save you time, money, and a lot of worry.
In this guide, we’ll walk through the key signs that indicate your tree needs trimming. You’ll learn to spot structural defects, health warning signs, and growth issues, and understand when it’s time to call in an ISA Certified Arborist. Whether it’s a sprawling gum in a coastal suburb or a backyard jacaranda in an inland block, these tips will help you make informed decisions about your trees before a problem becomes an emergency.
Direct Safety Hazards And Deadwood
When it comes to tree trimming, safety always comes first. I’ve spent over two decades inspecting trees across Perth—from coastal suburbs with salt-scorched gum trees to inland blocks where jacarandas crowd driveways—and the most common hazards are often hiding in plain sight. Catching these issues early prevents property damage, protects your family, and avoids expensive emergency removals.
Dead Or Dying Branches
Deadwood is a silent threat. Branches that have no leaves during spring or summer, are brittle, or have peeling bark are prone to snapping without warning. On a hot Fremantle afternoon, I once watched a resident narrowly avoid a fallen wattle limb while collecting the morning paper—deadwood is unpredictable, and even medium-sized branches can cause serious injury or damage.
How to spot dead branches:
- No new growth during the growing season
- Brittle twigs that snap easily under gentle pressure
- Peeling or missing bark, especially on older limbs
- Fungal growth, such as mushrooms or shelf brackets, at the base or along the branch
A simple test is to tap the branch lightly with a stick—if it sounds hollow or breaks easily, it needs to be removed. For gum trees along coastal blocks, I often find limbs that seem fine from the street but are brittle when inspected closely.
Broken Or Hanging Limbs
“Hangers,” sometimes called “widow makers,” are branches that are cracked, splintered, or bowing under weight. After storms, I’ve seen large jacarandas in Mount Lawley with limbs hovering above footpaths like ticking time bombs. Removing these promptly is essential.
Signs of hangers:
- Visible splits along the limb
- Branches bent under their own weight
- Twigs drooping unnaturally
Storm And Weather Damage
Perth storms and strong summer winds can bend branches, snap limbs, or reveal hidden weaknesses. After any severe weather, inspect your trees for:
- Bent or twisted branches
- Splits in major limbs
- Newly formed cracks in trunks
- Limbs heavily laden with fruit or seed
A proactive check after storms is far safer than waiting for damage to happen. Even minor splits can worsen with seasonal winds, and the cost of trimming early is far less than dealing with structural damage or liability after a limb falls.
Structural Defects And Unbalanced Growth
Beyond immediate hazards, a tree’s shape and structure can hint at long-term stability issues. Trees with poor weight distribution, crowded canopies, or unbalanced growth are more likely to suffer limb failure, split during storms, or decline faster than healthy, well-shaped trees. In Perth, we often see codominant stems in older Jacarandas along suburban streets and gum trees with included bark in coastal blocks—both conditions that can silently compromise stability over the years.
Codominant Stems And Included Bark
When two main trunks of similar size grow from the same spot, they form a narrow, V-shaped union. Bark trapped between the trunks—called included bark—prevents the wood from bonding properly. In strong winds or after summer storms, these unions can split, sending branches crashing to the ground.
Checklist for codominant stems:
- Two main trunks of similar diameter emerging from the same base
- Narrow V-shaped union with bark visibly trapped between the trunks
- Signs of splitting or stress along the union
Example: On a property in Mt Lawley, a neighbour’s large gum had two codominant trunks. One strong gust of wind cracked the union; luckily, a timely inspection had already flagged the issue, and a qualified arborist safely removed one trunk before damage occurred.
Crossing And Rubbing Branches
Branches that rub against each other can damage bark and create entry points for disease and decay. I often see this in inland suburbs where dense Jacaranda canopies grow over fences or driveways. Left unchecked, these rubbing branches weaken structural integrity and reduce airflow through the canopy.
Checklist for crossing limbs:
- Branches that physically touch or rub continuously
- Bark damage visible at points of contact
- Areas where airflow seems restricted, or leaf density is abnormal
Pruning one of the competing branches restores balance, prevents disease, and improves overall canopy health.
Unusual Or Lopsided Shape
Trees can become uneven or “top-heavy” due to improper pruning or competition for sunlight. This poor weight distribution concentrates stress at the ends of limbs, making them prone to breaking during storms or high winds. In my experience, older lemon-scented gums in coastal Perth blocks often lean dramatically toward open space, leaving neighbouring properties at risk.
Checklist for lopsided trees:
- Uneven canopy with weight concentrated on one side
- Branches excessively long compared to the rest of the canopy
- Leaning trunk or major limbs shifting from vertical
Corrective trimming can redistribute weight, remove hazardous overextensions, and guide the tree toward a safer, more balanced shape over time.
Health And Biological Warning Signs
Trees don’t always show their weaknesses on the surface. Often, the most dangerous issues are hidden inside the trunk or roots, and visible cues in foliage, bark, or fungal growth can provide early warnings. In Perth, after a brutal summer or a series of winter storms, these biological signs are often the first clues that a tree is struggling.
Fungi And Mushrooms
Mushrooms or bracket fungi growing at the base of a tree or along the trunk often indicate internal decay or root rot. I’ve seen a backyard in Joondalup where a seemingly healthy lemon-scented gum suddenly collapsed; closer inspection revealed fungal growth that the homeowner hadn’t noticed weeks earlier.
Checklist for fungal warning signs:
- Mushrooms or shelf brackets on the trunk or at the base
- Soft or spongy wood near fungal growth
- Crumbling bark around affected areas
Even small fungi are a signal to call a professional arborist before the tree becomes a hazard.
Trunk Cracks And Cankers
Deep splits, sunken bark, or cankers can indicate structural failure within the trunk. Cracks that widen over time or bark that’s peeling in unusual patterns often mean the tree is under stress and at risk of breaking under load.
Signs to watch:
- Long vertical splits or seams in the trunk
- Sunken or discoloured bark patches
- Bark oozing sap in an irregular pattern
A tree with visible trunk cracks is not just unsightly—it’s a safety concern, especially near paths, sheds, or driveways.
Poor Leaf Condition
Leaves that are small, yellowing (chlorosis), or dropping prematurely during midsummer often indicate root stress, nutrient deficiencies, or vascular system problems. For example, in Wangara, I’ve noticed that overwatered palms in certain canopy areas are developing sparse leaf growth, signalling the need for corrective pruning and soil management.
Checklist for leaf health:
- Discoloured or spotted leaves
- Premature leaf drop during the active growing season
- Sparse growth in sections of the canopy
- Slow overall growth compared to similar trees in the area
Monitoring these signs early allows for targeted pruning or professional treatment, often saving the tree from decline.
Growth Management And Obstructions
Maintaining a tree’s relationship with its surroundings is just as important as keeping it healthy and safe. Overgrown or mismanaged trees can interfere with your property, neighbours, and local infrastructure.
From driveways in Nedlands to coastal properties in Scarborough, I’ve seen trees encroaching on everything from roofs to retic systems, often because no one spotted the early warning signs.
Interference With Structures
Low-hanging limbs that touch roofs, fences, or powerlines aren’t just inconvenient—they’re a safety and maintenance hazard. During storm season, these branches can scratch roofs, pull down wires, or damage gutters.
Checklist for structural interference:
- Branches touching roofs or gutters
- Limbs overhanging driveways or footpaths
- Branches encroaching on fences or retaining walls
- Contact with utility lines (always call the local provider before trimming)
In one Perth backyard, a neighbour’s overhanging jacaranda repeatedly damaged a roof gutter; a scheduled trim prevented costly repairs and maintained clearance for retic lines.
Water Sprouts And Suckers
Vigorous shoots that grow along the trunk (water sprouts) or at the base (suckers) divert energy from the main canopy, create crowding, and can increase the risk of disease. Removing these helps the tree focus its resources on structural branches and healthy foliage.
Checklist for water sprouts and suckers:
- Shoots growing vertically along the main branches or trunk
- Spindly or weak growth that crowds the canopy
- Any shoots competing with primary branches for light and nutrients
Regular inspection and pruning of these growths prevent a tangled canopy and reduce the risk of storm damage.
Crowded Canopy And Obstructed Views
Trees with overly dense canopies can block sunlight from gardens, reduce airflow, and even create microclimates that encourage pests. In some Perth suburbs, dense jacaranda or eucalyptus canopies obscure neighbours’ views, while also causing leaves to accumulate in gutters.
Checklist for crowded canopies:
- Branches growing inward or tightly packed
- Reduced airflow or light penetration
- Obstruction of driveways, patios, or garden beds
- Heavy seed or fruit drop creates a mess or hazards
Pruning for canopy thinning improves sunlight penetration, strengthens structural integrity, and promotes healthier overall growth.
Professional Assistance And Maintenance Advice
While many warning signs can be spotted by property owners, some issues require the trained eye of a professional arborist. Trees with structural defects high in the canopy, internal decay, or complex branching patterns need careful evaluation to prevent accidents.
In Perth, I’ve seen experienced homeowners attempt high pruning on large gum trees, only to realise the risks were beyond the scope of safe DIY methods.
When To Call An Arborist
Engaging an ISA Certified Arborist is essential when you encounter:
- Dead or hanging limbs that cannot be safely reached
- Codominant stems with included bark
- Trunk cracks, cankers, or fungal growth
- Limbs overhanging powerlines or inaccessible roofs
Professional arborists not only assess tree health but also provide safe, efficient trimming and removal services, minimising property damage and ensuring compliance with local regulations.
Suggested Maintenance Timelines
A structured tree maintenance plan keeps your trees healthy and safe over the long term. Based on years of field experience across Perth:
|
Task |
Frequency |
Notes |
|
Visual inspection of canopy, limbs, and structure |
Every 3–6 months |
Check for broken limbs, rubbing branches, or sparse growth |
|
Professional arborist inspection |
Every 1–2 years |
ISA Certified arborist evaluates internal decay, codominant stems, and disease |
|
Minor corrective trimming |
Annually |
Thin canopy, remove suckers and water sprouts, improve airflow |
|
Major pruning/removal |
As needed |
Based on risk assessment, storm damage, or safety hazards |
Creating A Personal Tree Maintenance Checklist
Homeowners can track the health of each tree by noting:
- Signs of deadwood or broken limbs
- Evidence of pest infestations or disease
- Overgrown branches affecting structures or views
- Canopy crowding or uneven growth
Maintaining this log allows for timely interventions, reduces emergency work, and ensures your trees thrive while keeping your property safe.
Regular tree inspections and timely trimming are essential for maintaining safety, structural integrity, and long-term health. By spotting dead or broken branches, structural defects, canopy crowding, and biological warning signs early, you can prevent property damage and reduce hazards in your yard.
Perth homeowners benefit from combining routine personal checks with professional assessments by ISA Certified Arborists, especially for high canopies or complex structural issues. Implementing a seasonal maintenance plan, supported by a checklist, ensures your trees thrive while keeping pathways clear, sunlight flowing, and neighbours safe. Healthy trees are not just beautiful—they’re an investment in safety and longevity.
