Not every flaw makes a tree dangerous — bark scars and a bit of deadwood are normal. But some signs mean a tree has moved from "keep an eye on it" to "get it looked at," and a few mean "call today."
What we're actually looking for
A dangerous tree usually advertises itself if you know the signs. The ones that put a tree near the top of our list:
- Cracks in the trunk — especially a deep vertical split or two cracks on opposite sides, which can mean the stem is already failing.
- Hollow or soft sections — a trunk that sounds hollow when knocked, or wood you can push a screwdriver into.
- Large dead limbs — bare, brittle branches high in the canopy ("widow-makers") that drop without warning.
- A sudden lean — new lean with cracked or heaved soil on one side means the roots are letting go.
- Exposed or damaged roots — from construction, grade changes, or erosion along a driveway.
- Fungal growth — mushrooms or shelf-like conks at the base often point to internal decay.
Why location multiplies the risk
The same defect matters far more over a bedroom than over the back fence line. When a compromised tree stands within striking distance of your house, driveway, a play area, or a hydro line, a failure stops being a yard cleanup and becomes a property-damage or injury problem. That's the calculation we make on every visit across Kitchener, Waterloo, Cambridge and Guelph: defect plus target equals priority.
Most hazardous trees give weeks or months of warning. The trouble is that nobody is reading the signs until a branch is on the car.
When to call
If you can see a fresh lean, a major crack, or a large dead limb hanging over something you care about, treat it as urgent — don't wait for the next storm to make the decision for you. For anything you're unsure about, a quick assessment costs nothing and usually ends in relief rather than a removal.
Book a free assessment, or for an active hazard call our 24/7 line at (226) 263-2319.