A healthy tree adds beauty, shade, and value to your St. Louis property. A failing one can do the opposite — dropping heavy limbs onto a roof, a car, or a person without warning. The tricky part is that trees don't always look dangerous until it's too late. Below are seven warning signs we tell homeowners to watch for. If you spot one or more, it's worth having the tree looked at.
1. Large Dead Branches or a Dead Canopy
Dead wood is the most common hazard. A few dead twigs can often be pruned out, but large dead limbs — or a canopy that's stopped leafing out across whole sections — signals a tree in serious decline. Big dead branches are heavy, brittle, and prone to falling in the next storm. When a tree is mostly dead, removal is usually the safe answer.
2. A Sudden Lean With Heaving or Cracked Soil
Many trees grow at a slight angle their whole lives and are perfectly stable. The danger sign is a new or worsening lean, especially when you see the soil cracking, mounding, or heaving on one side of the base. That means the root system is failing or pulling out of the ground — a tree that can come down all at once. Treat a freshly leaning tree as urgent.
3. Trunk Cracks, Cavities, or Hollows
The trunk is the tree's backbone. Deep vertical cracks, large open cavities, or a hollow sound when you knock on the wood all point to compromised structure. A small, sealed-over wound may be fine, but significant cracks or hollows reduce the trunk's strength and raise the odds of failure — particularly in high wind.
4. Fungus or Mushrooms at the Base
Mushrooms, shelf-like conks, or other fungal growth at the base of a tree or on its major roots are a red flag for internal decay. Many of these fungi feed on dead and rotting wood inside an otherwise green-looking tree. Because the damage is hidden inside the trunk and roots, a tree with significant basal fungus can be far weaker than it appears.
Not every problem means removal. Some trees can be saved with targeted pruning to remove dead wood, or with cabling and bracing to support a weak union. We give honest assessments — if your tree can be kept safely, we'll tell you, and recommend pruning instead of removal.
5. Storm Damage
St. Louis summers bring serious thunderstorms, and the aftermath often makes the removal decision for you. A split trunk, large hanging or broken limbs, or a tree that's partially uprooted is both an immediate hazard and frequently beyond saving. Even when a storm-damaged tree survives, the wounds can lead to decay down the road. Damaged trees should be assessed promptly.
6. Disease or Infestation
Some pests and diseases are death sentences for a tree. The clearest local example is the emerald ash borer, which has killed huge numbers of ash trees across the region. EAB-killed ash become brittle remarkably fast and turn into serious hazards near homes and walkways. Oak wilt, advanced canker diseases, and heavy infestations are other cases where removal is often the responsible choice. (See our guides to emerald ash borer and oak wilt.)
7. Roots or Branches Threatening Your Home or Power Lines
Sometimes the tree is healthy but in the wrong place. Roots lifting a foundation, driveway, or sewer line, or a canopy growing into your roof or tangled in power lines, can all justify removal — or at least significant pruning for clearance. A tree pressed against the house also traps moisture and gives pests a bridge indoors. We coordinate carefully around utility lines on these jobs.
Why Acting Early Pays Off
It's tempting to put off dealing with a questionable tree, but problems in trees rarely improve on their own — decay spreads, dead wood accumulates, and a slight lean tends to worsen. Catching a hazard early often means you have options: a tree that might have been saved with timely pruning a year ago may be past saving once decay has hollowed the trunk. And from a safety and cost standpoint, planned removal on a calm day is always preferable to an emergency call after a limb has already come down on your roof or your neighbor's. If something about a tree has been nagging at you, an inspection is the cheapest insurance there is.
A Quick Self-Check
Walk your property a couple of times a year — ideally after leaf-out in spring and again after the leaves drop in fall — and look for the signs above: dead branches against the sky, fungus at the base, fresh cracks, soil heaving, and limbs creeping toward the house or wires. Pay special attention after major storms. Most serious tree failures give some warning if you know what to look for, and a quick seasonal habit can help you catch trouble before it becomes a hazard.
When in Doubt, Get an Honest Look
You don't have to diagnose your tree alone. Our experienced crews will assess its condition, surroundings, and risk, then give you a straight recommendation — removal only when it's truly needed. If it does have to come down, we handle safe tree removal with full cleanup. We serve homeowners across St. Louis City, Clayton, and Florissant, along with the rest of St. Louis City and County.