In our month-by-month pruning calendar we tell people to walk their property in late September and mark anything dead, damaged, or structurally questionable.
Fair enough. But nobody ever tells you what you're looking at.
So here's the walk. It takes about twenty minutes on a typical lot, it needs no tools, and it's the single most useful thing a homeowner can do for their trees all year.
The short version
Start at the ground and work up. Roots first, then trunk, then canopy — because the failures that hurt people almost always start below the part you're looking at.
You are not trying to diagnose anything. You're trying to build a short list of things worth a second opinion. That's it.
Why fall is the honest season for this
Three things line up in autumn that don't line up any other time of year.
Decay fungi fruit now. The mushrooms and shelf-like conks that grow out of a trunk or root collar are the fruiting bodies of fungi that have been digesting the inside of the tree, often for years. Armillaria is the one to know here: the Missouri Department of Conservation notes that in late summer and fall, clusters of honey-colored mushrooms may grow at the base of infected trees, leaving a white rot — soft, stringy wood — that weakens the tree structurally. The ringless honey mushroom fruits at the base of trees and stumps, especially oaks, from September through November. And fruiting bodies are the most obvious and diagnostic indication of stem decay available to someone standing on the ground. A cluster you can see in October is rot you couldn't see in July.
Stress shows up as color. A healthy tree in Greene County turns when its neighbors turn. A tree that colors up three weeks early, or drops its leaves in September, usually isn't being seasonal — it's being stressed. That's a real signal, and it's only readable right now.
Leaf-off reveals the frame. Once the leaves are down, branch structure is finally visible — deadwood, bad unions, cracks, the whole architecture. Late October through November is the clearest look you'll get at your own trees.
Then the dormant window opens and the work can actually be done. Find it in October, fix it in December.
Start at the ground
Walk a slow circle around each major tree, close in, looking down.
Can you see the root flare? The trunk should widen where it meets the soil, like a foot in a shoe. If your tree goes into the ground like a telephone pole — straight sides, no flare — something is burying it, whether that's mulch piled against the trunk, added fill soil, or a circling root strangling the base. Buried flares rot.
Is the soil disturbed? Cracked, heaved, or lifted soil on one side of a tree means the root plate is moving. On a leaning tree, look at the soil on the side opposite the lean — that's where the plate lifts first. This is the one item on this entire list that means stop reading and call someone.
Are there mushrooms? Location matters enormously. Mushrooms scattered in your lawn are usually breaking down old organic matter and have nothing to do with your tree. Mushrooms or hard, shelf-like conks growing out of the trunk, out of the root flare, or in a tight cluster right at the base are a different conversation entirely. Photograph them. Don't kick them off — that's the evidence.
Is there sawdust? Fine sawdust or frass piled at the base is often carpenter ants, and carpenter ants excavate wood that's already soft. They're a symptom, not usually the cause.
Work up the trunk
Now look at the first ten or twelve feet.
Cavities and openings. An opening into the trunk interior matters more than most homeowners think and less than most fear. A shallow pocket is common in old trees. An opening you could put your arm into, on a stem holding weight over a driveway, is worth an assessment.
Vertical seams and cracks. A crack running up and down the trunk, especially one open enough to see into, means the stem is already failing in a mechanical sense. These don't heal.
Bad unions. Where the trunk splits into two roughly equal stems, look closely at the crotch. If the bark there is pushed up into a raised ridge and the two stems press tightly together with no visible branch collar, that's included bark — bark trapped inside the union instead of wood grown across it. It's one of the most reliable predictors of a tree splitting in half in a storm, and it's extremely common on Bradford pears, silver maples, and multi-stemmed river birch across southwest Missouri.
Dead or missing bark. A patch of bark falling away with dead wood underneath means that section of the trunk's plumbing is gone.
Then look up
Step back far enough to see the whole crown. This gets easier as leaves start dropping.
Deadwood. Some deadwood is normal on any mature tree. What matters is scale and position: a dead limb over a patio, a driveway, or a bedroom is a different priority than the same limb over open lawn.
Hangers. Broken limbs caught up in the canopy, still there from the last storm. These come down on their own schedule, not yours.
Lean. An old lean the tree has grown into — trunk curving back toward vertical — is usually fine; the tree has been building reaction wood for decades. A new lean, with a straight trunk and disturbed soil at the base, is not.
Thin, sparse, or undersized leaves. A crown noticeably thinner than the same species nearby is a tree running short on something.
Dieback from the top down. Dead twigs and branches concentrated in the upper crown — sometimes called stag-heading — usually points to a root or vascular problem, not a branch problem.
Early color on one branch or one side only. This is the one to take seriously. Uniform early color is stress. Early color or wilting on a single limb or one side of an oak can be a vascular problem, and in the red oak group that raises the question of oak wilt, which moves fast.
The five that mean call this week
Everything above is worth writing down. These five are worth a phone call before the next storm:
- Heaved or cracked soil at the base, or a lean that's new.
- Conks or clustered mushrooms on the trunk or root flare — not in the lawn.
- A vertical crack you can see into, on a stem over something you care about.
- A large dead limb or a hanger above a driveway, walkway, deck, or roof.
- One-sided wilting or early color on an oak.
What this walk is not
You're triaging, not diagnosing. The distinction matters, because most of what looks alarming isn't.
Fall webworm builds those ugly gauzy tents on branch tips in late summer and is almost entirely cosmetic on a mature tree. Normal fall color is not a symptom. A few dead twigs in a big oak are not a symptom. Mushrooms in the lawn, again, are usually just mushrooms.
And the reverse is truer still: a tree can be extensively decayed inside and look completely fine from your driveway. Internal decay doesn't always produce fruiting bodies, and the trees that surprise people are usually the ones that looked healthy right up until the ice loaded them. That's the honest limit of a visual walk-through, and it's why arborist diagnostics is a separate thing from tree work.
What this walk does do is turn a vague worry into a specific list — which is the difference between a useful site visit and a guessing session.
When to call
Do the walk now, while the fungi are fruiting and before the leaves are fully down. Take photos of anything on your list, including the base of the tree and the whole tree from far enough back to see its shape.
If your list comes up empty, you've spent twenty minutes and learned your trees. That's a good outcome, and there's nothing to buy.
If something on it matches the five above, we'll come look. Sometimes the answer is structural pruning in December, when the timing is right anyway. Sometimes it's removal before winter. And often enough the answer is that the tree is fine and you can stop thinking about it — we talk people out of removals routinely, and we'd rather do that than take down a tree with twenty good years left in it.
(417) 414-0720 · Request an assessment