How to Identify When a Tree Needs to Be Removed: 8 Warning Signs

Trees provide shade, improve outdoor spaces and support local wildlife. However, a damaged, diseased or unstable tree can become a safety concern for people, buildings and surrounding property.

Knowing how to identify when a tree needs to be removed can help you address potential hazards before they become emergencies. Some warning signs are easy to spot, while others require a closer inspection by a qualified arborist.

Not every unhealthy or overgrown tree needs to be removed. In many cases, appropriate pruning or maintenance may resolve the problem. The right decision depends on the tree’s condition, stability, location and potential risk.

Here are eight warning signs that indicate a tree may need professional assessment and, in some cases, removal.

1. The Tree Has Started Leaning Suddenly

Some trees naturally grow at an angle, so a lean does not automatically mean a tree is dangerous. However, a tree that suddenly starts leaning or develops a noticeably greater lean may have a structural problem.

Possible warning signs include:

• Soil lifting or cracking around the base.
• Exposed, broken or damaged roots.
• A tree leaning further after strong winds.
• The ground appearing raised on one side of the trunk.
• New cracks where the trunk meets the ground.

These signs may indicate that the root system is no longer anchoring the tree securely.

What should you do? Keep people away from the affected area and arrange a professional assessment. If the tree appears unstable or could fall onto a house, road or occupied area, treat it as an urgent safety concern.

2. Large Dead or Falling Branches Are Becoming Common

Occasional small dead branches can occur naturally, but repeated branch drop or large dead limbs may indicate a problem with the tree’s health or structure.

Pay attention to branches that are:

• Bare while surrounding branches have healthy foliage.
• Cracked, hanging or partially detached.
• Dead near the main trunk or upper canopy.
• Falling without an obvious cause.
• Positioned above paths, driveways, roofs or outdoor seating areas.

Dead branches can fall unexpectedly, especially during strong winds. Depending on the tree’s condition, selective pruning may be enough to reduce the risk. If the main trunk or major structural limbs are severely compromised, removal may need to be considered.

3. The Trunk Has Deep Cracks or Splits

The trunk supports the tree and helps transfer its weight safely through the root system. Large cracks, deep splits or separated sections can indicate structural weakness.

Look for:

• Long cracks running down the trunk.
• A split between two major stems.
• Sections of bark separating from the wood.
• Large wounds that appear to be worsening.
• Cracks that have developed after a storm.

A small surface wound does not necessarily mean the tree must be removed. However, significant cracks in the trunk or main branch unions should be assessed by an experienced professional.

Avoid standing beneath a tree with a major split, particularly if the damaged section hangs over a building, vehicle or frequently used area.

4. The Tree Shows Signs of Extensive Decay

A tree can have internal decay even when some of its leaves still look healthy. As decay progresses, it may weaken the trunk, branches or roots and reduce the tree’s ability to support its own weight.

Possible indicators include:

• Soft, crumbly or deteriorating wood.
• Cavities or hollow sections in the trunk.
• Fungal growth around the trunk base or major roots.
• Large areas of missing or damaged bark.
• Extensive deadwood or a declining canopy.

These signs do not prove that a tree is unsafe on their own. Some trees can remain stable despite limited decay, while others may be hazardous because of the location and extent of the damage.

A professional assessment can help determine whether the tree can be retained safely, requires pruning or needs removal.

5. The Roots Are Damaged or the Ground Around the Tree Is Changing

Roots anchor a tree and provide water and nutrients. Root damage can affect stability even when the upper part of the tree appears relatively healthy.

Warning signs may include:

• Roots that have been cut during construction or landscaping.
• Soil cracking or lifting around the trunk.
• Exposed roots showing signs of damage.
• A sudden change in the tree’s lean.
• Significant ground disturbance near the root zone.

Tree roots can also affect paving, drainage systems and other structures. However, roots near a driveway or pipe do not automatically mean the tree must be removed.

The cause and extent of the problem should be investigated before deciding on a solution. Avoid cutting large roots yourself, as doing so can weaken the tree or create a new safety risk.

6. The Tree Is Losing Leaves or Declining Rapidly

Changes in foliage can indicate stress, disease, pest activity or environmental problems. A tree that develops widespread leaf discolouration, unusual leaf loss or significant branch dieback may need attention.

Look for:

• Leaves turning brown or yellow outside their usual seasonal pattern.
• Large sections of the canopy losing foliage.
• Branches dying back progressively.
• Unusual growth changes over a short period.
• Visible signs of pest damage or disease.

These symptoms can have several causes, including drought, poor drainage, root disturbance or infection. Some problems can be treated through appropriate tree care, so leaf loss alone is not enough to determine that removal is necessary.

If the decline is severe or continues despite suitable care, arrange an assessment to establish whether the tree can recover.

7. The Tree Is Damaged After a Storm

Strong winds, heavy rain and lightning can damage branches, split trunks or destabilise roots. A tree that remains standing after a storm may still have hidden structural damage.

After severe weather, check from a safe distance for:

• Broken or hanging branches.
• A split trunk or damaged major limbs.
• A new or increasing lean.
• Exposed roots or disturbed soil.
• Branches resting on a roof, fence or vehicle.
• Contact with electrical wires.

Do not approach a tree that has fallen onto powerlines or attempt to remove hanging branches yourself. Keep away and contact the relevant electricity network or emergency service as appropriate.

For storm-damaged trees, professional tree removal services in Adelaide may be required when the tree cannot be retained safely. In other cases, carefully planned pruning or branch removal may resolve the issue.

8. The Tree Has Outgrown Its Location

A tree can become difficult to manage when it grows too close to a house, driveway, fence, retaining wall or overhead service.

Potential problems include:

• Branches repeatedly contacting a roof.
• Large limbs extending over heavily used areas.
• Restricted access caused by excessive growth.
• Damage to nearby structures or paving.
• Conflicts with overhead wires or other infrastructure.

Size alone is not a reason to remove a tree. Suitable pruning may provide enough clearance while preserving the tree’s benefits.

If the conflict cannot reasonably be managed through pruning or other maintenance, removal may be one option to consider. For trees that need ongoing maintenance rather than complete removal, explore professional tree pruning and cutting options.

Should You Remove the Tree or Arrange Pruning?

The best option depends on the cause of the problem and whether the tree can be retained safely.

This table is a general guide, not a substitute for an on-site inspection. A qualified arborist can assess the tree’s condition, location and surroundings before recommending a practical solution.

Why You Should Not Remove a Tree Yourself

Tree removal can be dangerous because branches and trunks may fall unpredictably, particularly when the tree is damaged or unstable. Working at height, operating cutting equipment and working near buildings or powerlines introduce additional risks.

Attempting DIY removal may also cause damage to roofs, fences, vehicles, underground services or nearby vegetation.

A professional tree service can assess the site, plan the work and determine the equipment and techniques needed for safer removal. This is particularly important for large trees, restricted-access locations and trees with significant structural damage.

Do You Need Council Approval to Remove a Tree in Adelaide?

Before removing a tree, check whether it is protected under the applicable South Australian planning rules. Some regulated or significant trees are subject to restrictions, and approval may be required for removal or certain types of work.

Requirements depend on the tree and the circumstances. Do not assume that a tree can be removed simply because it is damaged, inconvenient or growing close to a structure.

Review the relevant requirements and seek advice before work begins. You can also read our guide to council approval for tree removal in Adelaide for more information.

If a tree presents an immediate danger, prioritise safety and contact the appropriate emergency or utility service when necessary. Ask the relevant authority about any rules that apply to urgent tree work.

What Happens During a Professional Tree Assessment?

An assessment helps establish whether the tree can be retained safely or whether further action is needed.

Depending on the situation, an arborist may examine:

1. Trunk and branch condition: Looking for cracks, deadwood, decay and structural weaknesses.
2. Root area: Checking for visible root damage, soil movement and signs of instability.
3. Canopy health: Identifying unusual leaf loss, dieback and possible disease symptoms.
4. Surrounding property: Considering buildings, fences, access routes, powerlines and areas used by people.
5. Available options: Determining whether pruning, monitoring, further investigation or removal is appropriate.

A photo can help explain what you have noticed, but it may not reveal hidden decay or root problems. An on-site assessment is often needed to make a reliable recommendation.

Frequently Asked Questions

How do I know if a tree is dangerous?
Warning signs include a sudden lean, major trunk cracks, damaged roots, extensive decay, large dead branches or storm damage. These signs do not always mean removal is necessary, but they warrant professional assessment, especially when people or buildings are at risk.

Can a tree look healthy but still need removal?
Yes. Some structural problems and internal decay are difficult to identify from the outside. A tree may retain green foliage while having weakened roots, a damaged trunk or other hidden problems.

Does a leaning tree always need to be removed?
No. Some trees naturally grow at an angle. A sudden or increasing lean, particularly when accompanied by soil movement or root damage, is more concerning and should be assessed promptly.

Is pruning enough, or does the whole tree need to be removed?
Pruning may be suitable when the problem is limited to particular branches or excessive growth. Removal may be considered when serious structural problems, extensive decay or instability cannot be managed safely through other work.

When should I call an arborist?
Arrange an assessment if you notice major cracks, extensive deadwood, significant root damage, a sudden lean, unusual decline or substantial storm damage. If the tree appears likely to fall or presents an immediate danger, keep clear and seek urgent assistance.

Can I remove a tree without council approval in Adelaide?
That depends on the tree and the applicable planning requirements. Check whether the tree is regulated or significant before arranging work, and confirm the requirements with the relevant authority.

Get Professional Advice About a Problem Tree in Adelaide

Identifying warning signs early can help you address tree problems before they become more serious. A sudden lean, major cracks, damaged roots, extensive decay or significant storm damage should never be ignored.

However, removing every tree that shows signs of stress is not always necessary. A professional assessment can help determine whether pruning, monitoring, further investigation or complete removal is the most appropriate option.

J&B Tree Services provides tree care and removal services across Adelaide. If you are concerned about a tree on your property, contact the team to discuss the issue and arrange an assessment.

Call J&B Tree Services on 0414 223 870 to discuss your tree and request a quote.