How to Tell If a Tree Is Dying, or Dangerous
Updated August 2026 · Reviewed by Robert Burgund, ISA Certified Arborist MI-4857A
- Established 2013
- 13+ Years Climbing Experience
- ISA Certified Arborist MI-4857A
- Fully Licensed & Insured
The difference decides whether you need a removal, a pruning visit, or nothing at all. Here is how to read your tree before you call anyone.
Start with the scratch test
Scratch a small patch of bark off a twig with your thumbnail or a pocketknife. Green and moist underneath means living tissue. Brown and dry means that section is dead.
Test several twigs on different sides of the tree, and test a couple of larger branches too, because a tree can be dead in the crown while the trunk still lives.
The reverse matters even more. A full green canopy proves nothing about the tree’s structure. Rot can be years along in the roots and the base of the trunk while the top still looks like a postcard.
Mature trees shed inner and lower branches naturally as the canopy closes overhead. A few dead limbs low on an old oak are normal housekeeping, not a death sentence.
Signs the tree is declining
- Thinning from the top down. The crown is the first thing a struggling tree stops supporting, so trouble almost always shows up there first.
- Smaller leaves than usual, or early fall color. Turning weeks ahead of the neighboring trees is the tree telling you something.
- Water sprouts. Thin shoots erupting straight out of the trunk. It looks like new life. It is actually a stress response.
- Bark peeling away in sheets, exposing smooth wood underneath.
- No new growth at the branch tips this season. Check the ends, because healthy trees extend every year.
Signs the tree is dangerous, which is a different list
These are the ones worth a phone call. Note that a tree can carry every one of them while fully leafed out and green.
| What you see | What it can mean | Urgency |
|---|---|---|
| Mushrooms or shelf fungi at the base | Rot in the roots or lower trunk. The mushroom is just the visible fruit, and the decay behind it has usually been spreading for years, though some fungi are far more destructive than others | High |
| A crack running down the trunk | Structural failure already in progress | High |
| Soil heaving or cracking opposite a new lean | The root plate is moving. The USDA Forest Service flags soil mounding on the side away from a fresh lean as an especially dangerous sign | Assess promptly |
| A new lean | Very different from the lean it has always had | High |
| A cavity or hollow in the trunk | Not automatically fatal, because it depends how much sound wood surrounds it | Assess |
| Two trunks meeting in a tight V | Bark is trapped inside the joint instead of wood, so the trunks were never truly attached. One of the most common places a tree splits in a storm | Assess |
| Dead branches over the driveway, patio or play area | A falling-limb hazard no matter how healthy the rest of the tree is | Prune |
Of everything on that list, shelf fungi at the trunk flare are the sign most often shrugged off. By the time they appear, decay in the structural roots is usually well advanced, and root failure gives no warning at all when it finally happens. They are also seasonal, so no mushrooms today does not mean no decay. Not a verdict on its own, but always a reason to have the tree looked at.
When removal is not the answer
A surprising number of trees that look finished are recoverable.
- A buried trunk flare. Soil or mulch piled against the trunk slowly girdles the tree over years. Root flare excavation can reverse a decline everyone had written off.
- Girdling roots wrapping the trunk, usually correctable if caught in time.
- Drought stress after a brutal summer. Many trees bounce back with water and a season of patience.
- Storm damage. Losing a big limb looks catastrophic, but crown restoration work saves a lot of these trees.
- A weak fork that can be cabled and braced instead of removed, often for a fraction of the cost.
Why a professional opinion is worth the small cost
There is an obvious conflict of interest in asking a company that sells removals whether your tree needs removing.
So protect yourself. Ask whoever assesses your tree whether they are an ISA Certified Arborist, look the name up in ISA’s public directory, and notice whether they ever recommend anything smaller than the biggest job available.
Michigan law adds a practical reason to get it in writing. A property owner generally is not liable when a healthy tree fails in a storm, but can be liable when a known hazard was left standing. A documented assessment protects you either way.
See our Michigan tree law guide →
Not sure what you are looking at?
Text us a photo, or book a free on-site assessment. If it does not need removing, that is exactly what we will tell you.
Call or Text 248-672-8058Request a Free Estimate
Written and reviewed by Robert Burgund
ISA CERTIFIED ARBORIST · MI-4857A
Owner of Tree Pros, LLC in Bloomfield Township. Verify the certification by name in ISA’s public directory.