7 Signs a Tree Is Dying or Dangerous

The signs a tree is dying or dangerous almost always show before it fails. The seven biggest red flags are fungal conks at the base, large cavities or hollows, dead limbs in the canopy, a sudden lean, soil heaving at the roots, deep bark cracks, and progressive canopy dieback. Spot one of these and it’s time for a professional assessment — before a storm makes the decision for you.

1. Fungal conks and mushrooms at the base

Shelf-like fungal growths (conks) or clusters of mushrooms around a tree’s base or roots are one of the most serious signs. Fungi feed on decaying wood, so their presence usually means the structural core — the part holding the tree up — is rotting from the inside. A tree can look perfectly green in the canopy while its base is compromised. On the mature oaks and maples common across Livingston and Chatham, base conks warrant a prompt look.

2. Cavities, hollows, and soft, crumbling wood

An open cavity or a spot where the wood is soft, punky, or crumbling indicates advanced decay. A tree can tolerate some hollowing — it’s the ratio of solid shell to hollow center that matters. Judging that ratio safely is a job for a certified arborist, not a guess from the ground. An arborist report can quantify how much sound wood remains.

3. Dead limbs and hanging branches

Bare limbs with no leaves during the growing season, or branches that snapped and are hung up in the canopy (“widow-makers”), are immediate hazards. Deadwood is brittle and drops without warning, often onto a driveway, roof, or walkway. Routine tree pruning removes deadwood before it becomes a projectile.

4. A sudden or worsening lean

Trees that grew at a slight angle their whole lives are usually fine. The danger sign is a new lean or one that’s getting worse — especially after a storm. A tree that shifts suddenly has often lost root anchorage, and it can go the rest of the way with the next strong wind. Pair a fresh lean with the next sign and you may be looking at an emergency.

5. Heaving or cracking soil at the roots

If the soil on one side of the trunk is mounding, cracking, or lifting — sometimes exposing roots — the root plate is failing. This is one of the clearest signals of imminent whole-tree failure and a reason to keep people and cars away and call for emergency tree service right away. New Jersey’s heavy clay soils, saturated by nor’easters and summer downpours, make root-plate failure a real risk here.

6. Deep bark cracks and included bark

Vertical cracks (called frost cracks or seams) that run deep into the trunk, and included bark — where two stems grow so tightly together that bark gets trapped in the union instead of solid wood — are structural weak points. Co-dominant trunks with a narrow, V-shaped union are especially prone to splitting apart in wind or under snow load. Many of these are candidates for cabling and bracing, which can add years of safe life to an otherwise valuable tree.

7. Progressive canopy dieback and thinning

When a tree’s crown thins year over year, leaves emerge smaller or sparser, or whole sections of the canopy die back, the tree is declining. The cause could be disease, pests like emerald ash borer, root damage, or drought stress. Reviewing our guide to common NJ tree diseases can help you connect the symptom to a cause — and catch it early enough to treat.

“People assume a hazardous tree means removal, but that’s not always true. A lot of what we see — included bark, a splitting union, deadwood — can be managed with cabling or targeted pruning. The mistake is doing nothing and hoping. Trees don’t heal; they compartmentalize, and problems only compound.” — Dave Lombardi, ISA Certified Arborist

Bonus sign: included bark and co-dominant stems

Worth calling out on its own because it’s so common on fast-growing NJ favorites like Bradford pear, silver maple, and river birch: a tree that forks into two nearly equal trunks with a tight, V-shaped union is structurally weaker than one with a single dominant leader. Bark gets pinched inside that union instead of solid wood knitting the stems together, so the join can split violently under wind, ice, or a heavy snow load — often taking half the tree, and whatever’s beneath it, down at once. Caught early, these unions are frequently good candidates for cabling and bracing rather than removal.

Does every warning sign mean removal?

No — and a good arborist will always look for a way to keep a healthy tree standing. Deadwood can be pruned, weak unions can be cabled, and many diseases and pests can be treated with plant health care. Removal is the answer only when the structural failure is too advanced to manage safely. For the full framework on that decision, read when does a tree need removing. And if a storm has already done damage, our guide to what to do after storm damage in NJ walks you through the first steps.

If you’ve spotted any of these seven signs on your property, don’t wait for the next nor’easter to test the tree. Our ISA Certified arborists provide honest, evidence-based assessments across Essex and Morris County. Contact us for a free on-site evaluation, or call (973) 434-5557.