Is Your Tree Dangerous? 7 Warning Signs You Need a Professional Tree Surgeon
From falling branches to hidden decay, discover how to spot potentially unsafe trees before storms cause serious damage.
Autumn is here and winter gales are not far behind. Trees that looked fine in summer can become a real risk once the leaves drop and the wind picks up. The good news is that most dangerous trees give you clues well before something goes wrong. Here is what to look for, and when to pick up the phone.
Why autumn and winter raise the risk
Saturated ground loosens roots, strong winds put heavy strain on weak limbs, and wet leaves and fruiting fungi can hide problems until it is too late. Falling branches can damage homes, cars and fences, and cause serious injury. A quick check now is far cheaper than storm damage later.
1. Dead or dying branches
One of the most obvious warning signs is deadwood in the tree canopy.
Dead branches can become brittle and break away, particularly during periods of strong wind, heavy rainfall or snow.
Look out for:
- Large branches without leaves during the growing season.
- Broken branches caught in the canopy.
- Sections of bark peeling away from dead limbs.
- Branches hanging over driveways, footpaths, roofs or neighbouring gardens.
Even relatively small branches can cause injuries or damage when falling from height.
When to call a tree surgeon: If dead or damaged branches could fall onto an area used by people or vehicles, arrange a professional assessment rather than attempting to remove them yourself.
2. Cracks, splits and hollows in the trunk
Deep vertical cracks or large cavities suggest internal decay. The tree may look healthy but have much less structural strength than it appears.
3. Fungi growing on the trunk or roots
Mushrooms and bracket fungi growing around a tree can sometimes indicate internal decay.
Some fungi are harmless to the structural stability of the tree, while others are associated with wood deterioration or root decay.
Signs worth investigating include fungal brackets attached to the trunk, clusters of mushrooms around the root area and areas of soft or crumbling wood.
When to call a tree surgeon: If fungal growth appears around a mature tree, particularly one close to a building, road or footpath, seek expert advice. The presence of fungi alone does not automatically mean the tree requires removal.
4. A new or worsening lean
Not every leaning tree is dangerous. Many trees naturally grow at an angle and remain stable for decades.
However, a newly developing lean, particularly after strong winds or prolonged rainfall, can indicate movement within the root system.
Warning signs include soil lifting around the base, exposed or damaged roots, and fresh cracks in the surrounding ground.
When to call a tree surgeon: A tree that suddenly changes position or shows signs of root movement should be treated as potentially dangerous and assessed urgently. Keep people away until it has been checked.
5. Root damage or lifting soil
Building work, trenching, or compacted and waterlogged ground can damage roots. Exposed, cut or heaving roots reduce stability.
6. Weak forks and overextended branches
Tight V-shaped joins where two stems meet are prone to splitting. Long, heavy branches reaching over a house or driveway add leverage in strong winds.
7. Storm damage
High winds place considerable stress on mature trees, particularly those with large spreading canopies or existing structural weaknesses.
Storm damage is not always obvious from ground level. A branch may have cracked but remain suspended within the canopy.
Following severe weather, visually inspect your trees from a safe distance for broken limbs, changes in the canopy, damaged bark and exposed roots.
When to call a tree surgeon: If a storm has damaged a tree or left branches hanging overhead, keep the area clear and arrange professional assistance. Never attempt to pull down a suspended branch.
What to do if you spot a warning sign
- Keep people, pets and vehicles away from the area.
- Do not climb or use a chainsaw on a damaged tree yourself.
- Take photos from a safe distance to help describe the problem.
- Call a qualified tree surgeon for a tree safety inspection.
When is it an emergency?
If a tree has fallen, is hanging over a property or road, or is blocking access, treat it as urgent. Emergency tree removal makes the situation safe quickly, protecting your home and family.
Talk to Trees n Gardens
Our team brings over 150 years of combined experience to homes, estates and commercial grounds across Warwickshire, Worcestershire, Gloucestershire and the Cotswolds.
If you are worried about a tree, get in touch for a friendly, no-pressure tree safety inspection and clear advice on the safest next step.
How do I know if a tree is dangerous?
Potential warning signs include large dead branches, sudden leaning, cracks in the trunk, damaged roots and significant storm damage. A qualified tree professional can assess whether these indicate an unacceptable risk.
Can a healthy-looking tree fall over?
Yes. Some trees may have hidden root damage, internal decay or structural weaknesses despite having a healthy-looking canopy.
Who should I call about a dangerous tree in my garden?
Contact an experienced, appropriately qualified and insured tree surgeon or arboricultural specialist. If a tree has created an immediate danger to people or is interfering with power lines, keep clear and contact the relevant emergency service or utility operator.
Should I have my trees checked before winter?
Autumn is a useful time to arrange an assessment, particularly where trees show visible defects or have suffered previous storm damage.
Will a tree surgeon remove the whole tree?
Not necessarily. Depending on its condition, selective pruning, deadwood removal or other management measures may be sufficient.
