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7 Signs a Tree Is Dangerous and Needs Attention

SafetyBy Richard Kemayou15 July 2026

A dangerous tree usually gives warning signs before it fails. Here are seven to watch for, and what to do if you spot them in your yard.

1. A new or worsening lean

Most trees lean a little, but a sudden lean, or one that is getting worse, is a red flag, especially if the soil or roots on one side are lifting. It can mean the root system is failing.

2. Large dead branches

Big dead limbs, sometimes called widow-makers, can drop without warning. If a tree has significant deadwood over a house, driveway or play area, it should be dealt with.

3. Cracks and splits

Vertical cracks in the trunk, or splits where large limbs join, weaken a tree and can lead to sudden failure.

4. Fungus at the base or on the trunk

Mushrooms and shelf-like conks growing on the trunk or roots often signal internal decay, which hollows out the wood you cannot see.

5. A hollow or soft trunk

A trunk that sounds hollow or has soft, crumbling wood has lost strength, even if the tree still has leaves.

6. Roots that are damaged or lifting

Cut, crushed or lifting roots, often from nearby digging or a lean, reduce how well a tree can hold itself up.

7. Branches dropping for no clear reason

A tree that keeps shedding limbs, especially in calm weather, is telling you something is wrong.

If you notice one or more of these signs, do not wait for a storm to find out how serious it is. Book a hazardous tree assessment and we will tell you honestly whether the tree can be made safe or needs to come down.

Learn more about our tree removal service if a tree does need to go.

Richard KemayouOwner & ISA Certified Arborist, Your Arborist Edmonton

Richard has spent years caring for Edmonton's trees, from routine pruning to hazardous removals, and writes to help homeowners make good decisions about their trees.

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