Homeowners usually call us at one of two moments: right after a tree fails, or years too late to prevent it. The window in between — when a tree is telling you something is wrong and it's still cheap to act — passes quietly, because the early signals don't look like emergencies.
Here's what we look at, roughly in order of how much it worries us.
1. Deadwood in the upper canopy
Trees allocate resources from the top down when they're struggling, so dieback almost always starts in the crown. Bare branches at the top while the lower canopy still leafs out is the classic pattern of a tree in decline — and it's the pattern for emerald ash borer in ash trees, which in Howard County should be your first assumption on any ash.
A few dead twigs is normal self-pruning of shaded interior growth. Structural limbs dead at the top, or a canopy noticeably thinner than the same tree last summer, is not.
2. The scratch test comes back brown
The simplest diagnostic there is. Scrape a small patch of bark off a twig with your thumbnail. Green and slightly moist underneath means living tissue. Brown, dry, and brittle means dead.
Do it in several places — low branches, high branches if you can reach, and different sides of the tree. Trees frequently die in sections, and a tree that's green on one side and brown on the other is telling you something specific about root damage or vascular disease on the dead side. Test in the growing season; in winter a dormant tree is still green under the bark.
3. Fungal conks on the trunk or root flare
This is the one we take most seriously, and the one homeowners most often shrug off. Shelf fungi or bracket conks growing directly out of the trunk, the root flare, or exposed roots mean the wood inside is decaying.
Here's why it's urgent: fungal fruiting bodies appear only after the internal decay is well established. By the time you see a conk, the structural wood behind it has typically been compromised for years. A tree can hold full green canopy — look perfectly healthy from the street — while the trunk supporting it is substantially hollow. Those are the trees that come down in ordinary wind and surprise everyone.
Conks at the base, on the root flare, are the worst location, because that's where the entire load of the tree is carried. Mushrooms scattered in the lawn nearby are usually just soil fungi and not a concern.
4. Cracks, cavities, and included bark
Look at the trunk and the major unions where big limbs meet the stem.
Vertical cracks running any significant length of the trunk indicate the tree is splitting under its own load. Cavities where a limb tore out or decay opened the trunk reduce cross-sectional strength — a rough rule is that more than about a third of the trunk circumference compromised is serious.
Included bark is the subtle one worth learning. Where two stems of similar size grow up in a tight V, bark can become trapped between them instead of the wood fusing properly. It looks like a normal fork. It's actually a seam, and mature co-dominant stems with included bark are a leading cause of the failures we get called out for after storms. Sometimes these are correctable with cabling; sometimes the answer is removal.
5. A lean that changed — and soil heaving at the base
Plenty of healthy trees lean. Trees grow toward light, and a tree that has leaned the same way for thirty years, with normal trunk taper and no soil disturbance, is usually fine.
What matters is change. A lean that appeared or worsened after a storm means the root plate moved. Check the ground on the side opposite the lean: soil cracking, heaving, or a raised mound means roots are tearing and the tree is in the process of failing. Exposed roots lifting on one side is the same signal.
This is the one condition on this list where we'd say stop reading and call someone today. A tree with a moving root plate is not a scheduling problem, it's an emergency.
6. Bark falling away in sheets
Some species shed bark naturally — sycamores and river birch look alarming and are perfectly healthy. What's abnormal is bark peeling to expose smooth, dry, dead wood underneath with no new bark forming.
Pay particular attention to the trunk base and root flare. Damage there — from string trimmers, mower strikes, or salt — accumulates over years and girdles the tree slowly. It's one of the most common causes of decline we see in suburban yards, and it's entirely preventable.
7. Sudden growth from the base
A flush of small shoots erupting from the trunk and root flare (epicormic sprouts, or "suckers") looks like the tree is thriving. It's usually the opposite: the tree is attempting to produce foliage anywhere it still has functional tissue because the main canopy is failing. In combination with crown dieback, it's a strong decline indicator.
What's worth saving
Plenty of struggling trees recover. Drought stress, soil compaction from construction, girdling roots, mulch piled against the trunk, and correctable pests all produce decline that looks frightening and is often reversible with the right intervention — proper mulching, root collar excavation, targeted pruning, or just water in a dry summer.
What generally isn't recoverable: extensive internal decay, root plate failure, more than roughly half the canopy dead, or a structural defect in a tree positioned to hit something that matters.
That last clause carries more weight than people expect. A defect only matters in proportion to what's underneath it. A hollow tree in the middle of a field can stand for decades and harm nothing. The identical tree twelve feet from a bedroom is a different decision entirely.
The cost argument for acting early
A declining tree taken down on a normal Tuesday is straightforward work at a normal price. The same tree after it fails is an emergency call, often with a crane, sometimes with structural damage attached, and typically with a deductible. And if it was visibly hazardous and you knew, the liability picture changes too — particularly if it lands on a neighbor's property.
We publish what removal actually costs in Ellicott City so you can weigh that against waiting.
Not sure what you're looking at? Send us a photo or call 410-826-9006. We'll tell you honestly whether it needs to come down or whether you're fine — free estimates across Howard County.