Tree Doc NJ Blog · Updated September 2026

7 Signs Your Tree Is Dying or Hazardous

Short answer: dead branches in the crown, peeling bark, fungus on the trunk, a new lean, and root damage are the big five warning signs. Here's how to read each one — and when to act fast.

1. Dead branches in the crown

Stand back and look at the top of the tree. A healthy tree has a full, even canopy; a dying one shows bare, leafless branches scattered through the crown, or a dead top with growth only below. Some deadwood is normal, but when a third or more of the crown is dead, the tree is in serious decline. Dead branches are the first to come down in wind — which is why regular deadwood removal matters.

2. Bark peeling, cracking, or missing

Bark is the tree's skin — when large patches slough off and don't grow back, something is wrong underneath. Vertical cracks, cankers, and bark falling away in sheets point to disease, decay, or pest damage. On ash trees across Clifton and Paterson, bark shedding in strips is the calling card of emerald ash borer kill.

3. Fungus on the trunk or at the base

Those shelf-like brackets growing out of the trunk — called conks — are the fruiting bodies of fungi digesting the wood inside. Mushrooms clustered at the base mean root rot. Either way, internal decay is advanced and the tree's strength is compromised. This is one of the clearest call-a-professional signs there is.

4. A new or worsening lean

A tree that has always leaned is usually fine. The dangerous lean is the new one: a tree that was straight last year and now tilts, especially with cracked or heaving soil at the base. That means the root plate is failing. White pines around Wayne's lakes do this after saturated-soil storms — a new lean is a call-us-now situation.

5. Root damage you can see

Roots are easy to damage without realizing it: utility trenching, driveway repaving, grade changes that bury the root flare, or construction severing roots on one side. A tree that lost major roots can look fine for a year or two — then fail in a storm it once would have shrugged off. If you've had construction near a mature tree, get it assessed.

6. Heavy woodpecker activity and boring holes

Woodpeckers don't eat wood — they eat what's in the wood. A tree suddenly covered in woodpecker holes is full of insects living in dead and dying wood. On ash, look for blonding (bark stripped hunting borer larvae) and D-shaped exit holes. The birds are telling you what the tree won't.

7. No leaves — or the wrong leaves at the wrong time

A tree that leafs out late, drops leaves early, or grows small, pale foliage is struggling. Compare it to the same species nearby — if every maple on the street is green and yours is thin and yellow in July, that's a stress signal. One bad season can be weather; two in a row is a pattern worth investigating.

What to do when you spot these signs

First, don't panic — and don't grab a chainsaw. Assess the target: what's under the tree? A declining tree in the back corner of a big lot can wait; the same tree leaning over a bedroom is an emergency. Second, get a professional assessment — we do hazard evaluations free across North Jersey and will tell you straight whether the tree is treatable, trimmable, or done.

If the verdict is removal, sooner is almost always cheaper and safer. Here's what removal costs in NJ — and why waiting rarely saves money.

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