Signs a Tree May Be Dangerous

New or worsening lean

Trees grow with the lean they have. A slight, long-standing lean often isn't dangerous. A new lean — or one that's getting worse over weeks — is a different conversation. Look at the base: soil cracking, lifted turf, or exposed roots on the side opposite the lean are meaningful warning signs.

Dead limbs over usable areas

Dead limbs don't get safer with time. Large deadwood over a driveway, walkway, deck, or roof should come down. This is one of the most common reasons we get called for targeted trimming rather than full removal.

Cracks and splits

Vertical cracks running down the trunk, splits at a major union where two large limbs meet, or peeling bark in a long strip can all indicate structural failure in progress. A trained eye can distinguish a cosmetic crack from a structural one — they look different and they matter differently.

Hollow or soft trunk

A trunk that sounds hollow when tapped, or that has visible cavities, has lost some of its structural wood. The tree can still stand if the outer shell is sound, but that assessment takes more than a look from the yard.

Fungal growth at the base

Mushrooms, conks, or shelf fungi on the trunk or at the root flare often signal internal decay. The species of fungus matters — some indicate more serious decay than others. That's a call for an arborist, not a DIY judgment.

Root movement

After heavy rain or a wind event, look at the base of the tree. Lifted soil, an exposed root crown, or a tree that seems to sit differently than it did before are serious signs. Root failure happens fast once it starts.

Storm damage

A tree that took a major hit — split top, torn limb at a union, lightning strike — should be evaluated before you assume it's fine. See our guide on what to do after a storm for the immediate steps.

Power lines

If a tree or limb is touching or near a primary power line, stay back and call the utility. Don't try to clear it yourself, and don't ask a tree crew to work around energized primary lines. That's the utility's call.

Removal vs. trimming vs. evaluation

Not every warning sign means removal. Some trees can be made significantly safer with targeted pruning, structural cabling, or ongoing monitoring. Others should come down. The point of an evaluation is to get an honest answer instead of guessing — or spending money on a tree that's already too far gone to save.

Targets — what's under the tree

A leaning, decayed tree in the middle of an empty back acre is a different risk than the same tree twenty feet from a child's bedroom. Risk is a function of the tree and what's beneath it. Houses, driveways, decks, play structures, parked cars, sidewalks, and outdoor living areas are the high-consequence targets. A failing tree over open lawn with nothing under it can sometimes be monitored. The same tree over the family room cannot.

Codominant stems and included bark

Many of the catastrophic tree failures we see in Middle TN happen at codominant unions — two large leaders growing from roughly the same point, with bark pinched between them instead of strong wood. The union looks normal until it splits. If you can see a tight V-shape where two trunks meet and a dark seam of bark running down between them, that's a structural weakness. It can sometimes be cabled, often thinned to reduce load, and occasionally needs to come down.

Trees damaged by construction

Anything within the dripline of a mature tree that involved digging, grading, trenching, soil compaction from equipment, or paving in the last few years is on the watch list. Construction-injured trees decline on a delay — often two to five years after the damage. Signs of decline in a tree near a project that happened a few seasons ago is not coincidence.

How a Tree Giants risk evaluation runs

A certified arborist walks the tree, examines the root flare, looks for structural defects in the trunk and major unions, assesses canopy health, identifies any disease or decay indicators, and looks at what's beneath the tree. You get a written read with one of four recommendations: keep, monitor on a defined schedule, mitigate (prune, cable, reduce load), or remove. We won't sell you a removal a prune can solve, and we won't tell you to monitor a tree that's actively dangerous.

What to do tonight if you're worried

• Move vehicles out from under the tree.
• Move kids' play equipment, patio furniture, or anything else of value out of the drop zone.
• If you have a bedroom under the tree and the signs are serious — large recent crack, new lean, root lift — sleep in a different room until it's been evaluated.
• Call. Photos help us triage. A walk-through usually beats a phone diagnosis.