Trees are remarkably resilient. They survive Michigan winters, summer droughts, ice storms, and decades of urban stress. But they’re not invincible. A tree that’s dying or structurally compromised is one of the most serious hazards on a residential property — and the tricky part is that the warning signs aren’t always obvious to the untrained eye.
For homeowners in Warren, Michigan, knowing what to look for can mean the difference between a proactive removal that costs a few hundred dollars and an emergency situation where a falling tree damages your home, your car, or injures someone on your property.
Dead or Dying Branches in the Upper Canopy
One of the earliest and most reliable signs that a tree is in serious trouble is dieback in the upper canopy — the topmost branches of the tree. Arborists call this “crown dieback,” and it typically indicates that the tree’s vascular system is failing. The tree can no longer move water and nutrients from the roots to the outermost branches, so the tips die first and the dieback progresses inward and downward over time.
Look for branches that have no leaves during the growing season, or branches where the bark has dried out and begun to peel away. In winter, dead branches are identifiable by their brittleness — a healthy branch bends; a dead one snaps. If you notice that a significant portion of your tree’s upper canopy is bare while neighboring trees of the same species are fully leafed out, that’s a serious red flag.
Fungal Growth at the Base or on the Trunk
Mushrooms, shelf fungi (also called bracket fungi or conks), and other fungal growths on or near a tree are almost always a sign of internal wood decay. These fungi are the fruiting bodies of organisms that are actively breaking down the wood inside the tree. By the time you can see the mushrooms on the outside, the decay inside may already be extensive.
Shelf fungi growing directly on the trunk are particularly concerning. Species like artist’s conk and chicken-of-the-woods indicate that the heartwood — the dense, structural core of the tree — is being consumed. A tree with significant heartwood decay can appear perfectly healthy from the outside while being structurally hollow inside, making it extremely dangerous in high winds.
Cracks, Splits, and Seams in the Bark
Vertical cracks running up the trunk of a tree, or horizontal splits at branch unions, are signs of structural weakness. These can result from frost damage (a common issue in Michigan winters), lightning strikes, or internal decay that causes the wood to shrink and crack. A crack that runs through the center of the trunk — called a “through crack” — is especially serious and often indicates that the tree is at imminent risk of splitting.
Seams where two major branches or trunks meet at a narrow angle (called a “co-dominant stem” or “included bark”) are also a concern. When two stems grow at a tight angle, bark gets trapped between them as they grow, preventing the wood from fusing properly. This creates a weak point that can fail catastrophically during storms.
Leaning That Wasn’t There Before
Trees naturally grow toward light, and many trees have a slight lean that’s been there for years without any problem. What’s concerning is a lean that has developed recently or that appears to be getting more pronounced. A sudden lean often indicates root failure — the roots on one side of the tree have died, rotted, or been severed, and the tree is beginning to tip.
Check the base of a leaning tree for soil heaving or cracking on the opposite side of the lean. This is a sign that the root plate is lifting out of the ground, which is a serious structural emergency. A tree in this condition can fall with very little warning.
Bark That’s Falling Off or Looks Abnormal
Healthy bark is the tree’s protective outer layer. When bark begins to fall off in large sections, revealing smooth, discolored wood underneath, it’s a sign that the cambium layer — the living tissue just beneath the bark — has died. This can result from disease, insect infestation, or physical damage.
In Warren and throughout Macomb County, the emerald ash borer has killed millions of ash trees, and one of the telltale signs is bark that splits and falls away as woodpeckers excavate the larvae underneath. If you have ash trees on your property and notice unusual bark loss combined with a thinning canopy, have them assessed immediately.
Root Damage and Construction Stress
Many trees in Warren’s established neighborhoods have been stressed by decades of construction activity — new driveways, utility trenching, home additions, and road work. Tree roots are far more extensive than most people realize, often extending two to three times the width of the canopy. When roots are cut, compacted, or buried under fill soil, the tree can decline slowly over several years before the damage becomes visible in the canopy.
If you’ve had significant construction work done near a large tree in the past five years and the tree now seems to be declining, root damage is a likely culprit.
When to Call a Professional
If you notice any of these warning signs on a tree near your home, driveway, or power lines, don’t wait. A certified arborist can perform a thorough assessment, probe for internal decay, evaluate the root system, and give you an honest recommendation. Sometimes a tree can be saved with targeted pruning and treatment. Other times, removal is the only safe option.
The cost of a professional assessment is minimal compared to the cost of emergency tree removal after a failure — or worse, the cost of repairing a home that a falling tree has damaged.
Ready for expert tree care in Warren? Contact the team at County Tree LLC today for a free estimate.