Trees fail every year in Raleigh, causing property damage, injuries, and occasionally fatalities. Most of these failures are preventable — if you know what to look for. Here are the five signs that demand immediate professional attention.
Sign 1: Dead or Hanging Branches ("Widow Makers")
Dead branches that remain hung in the canopy after breaking are called widow makers for a reason. These branches can fall without warning — no storm required. Wind, an animal, or simply the continued decay of the attachment point can trigger the fall. Dead branches are identifiable by lack of foliage in season, dry and brittle wood, and bark that is falling off.
In Raleigh, loblolly pines commonly shed dead branches 20–50 feet in the air after drought stress or bark beetle damage. A single pine branch of that size weighing 50–200 pounds falling from that height has enough energy to penetrate a roof, damage a car, or cause a serious injury.
Sign 2: Significant Lean — Especially New Lean
Many trees have a natural lean that has been there for years — this is generally not an immediate concern if the lean has been stable. A NEW lean, particularly one that developed suddenly after rain, wind, or drought, is an urgent warning sign. New lean indicates that the root system has shifted, which means the tree is partially or fully uprooted and may fail completely at any time.
Look for these signals accompanying a new lean: soil heaving on the opposite side of the lean (roots lifting the ground), cracking soil near the base, visible root exposure on one side, and leaning toward a structure or occupied area.
Sign 3: Hollow Trunk or Cavities
All trees carry some internal decay as they age — this is normal. Trees can remain structurally sound with interior decay because the structural wood (xylem) is primarily in the outer rings. However, when internal decay advances beyond roughly one-third of the trunk's cross-section, structural integrity is significantly compromised.
Warning signs include: visible cavities in the trunk, large fungal conks (mushroom-like growths) at the base or on the trunk (indicating internal wood decay), and a hollow sound when the trunk is struck. Do not probe cavities yourself — some harbor stinging insects and entering structural voids in trees is dangerous.
Sign 4: Root Damage or Decay
Root damage is often the most difficult to identify because most of it is underground. Signs you can see: mushrooms or fungal growth at the base of the tree (indicating root rot), soil subsidence around the trunk, construction activity that trenched within the root zone (roots extend 2–3 times the canopy radius), changes in soil grade near the trunk, and visible root decay where roots emerge from the soil.
Root-damaged trees are particularly dangerous because they can appear healthy in the canopy while being fundamentally unstable. A wind event that a healthy tree would easily survive can topple a root-compromised tree.
Sign 5: Disease or Severe Pest Infestation
Not all tree disease is immediately life-threatening to the tree, but some conditions progress rapidly and create danger. In the Triangle, watch for: small, perfectly round holes in bark arranged in rows (bark beetle exit holes in pine), cankers — sunken, discolored dead areas on bark — that are expanding, unusual off-season leaf drop, and progressive die-back starting at branch tips and moving toward the trunk.
Infested pine trees, in particular, can go from appearing stressed to completely dead in 4–6 weeks during summer. Dead standing pines are among the most dangerous trees in the Triangle because they lose structural integrity rapidly after death and their root systems decompose, making the entire tree unstable.
What to Do If You See These Signs
Call a licensed arborist. A professional assessment will tell you whether the situation is truly dangerous, how urgent the response needs to be, and what options you have. Do not wait for the storm season to find out the hard way. As a Raleigh homeowner, you also have a legal obligation to address known hazard trees — if a tree you know is dangerous falls on your neighbor's property, you may be liable for the damages.