An old stump doesn't just sit there quietly. Give it a season or two and it starts sending you messages — a ring of skinny sprouts shooting up around the base, a cluster of mushrooms appearing overnight after a rain, a soft spot in the lawn that gives a little under your foot. Most Derby homeowners notice one of these and assume the worst, or ignore all three and assume nothing. Neither reaction is quite right. Each of these three signs is telling you something specific about what's happening underground, and once you know how to read them, deciding whether to grind the stump this month or let it be for another season becomes a much easier call.
This guide walks through what sprouts, mushrooms, and sinking soil each actually indicate, which of those signs are cosmetic and which are worth a closer look, and how to decide when it's time to book. If you want the full rundown on cost, depth, and what your yard looks like afterward, our complete stump grinding guide covers that ground in detail — this post is about reading the signals first.
Sign 1: Sprouts Shooting Up Around the Stump
Those thin, whip-like shoots ringing the base of the stump — or popping up several feet away in the lawn — are called suckers, and they're one of the clearest signals a stump can send: the root system underneath is still very much alive. When a tree is cut down, the roots don't die immediately. They're still holding stored energy, and many species respond to the loss of their canopy by throwing up new growth wherever a dormant bud happens to be, sometimes right at the stump, sometimes from a root running well outside where you'd expect.
Some species are far more aggressive about this than others. Elm, cottonwood, and silver maple are the repeat offenders in Derby yards — cut one of these down and skip the grinding, and you can expect a fresh crop of suckers every spring for years. Other species, like most oaks, sucker far less reliably.
On its own, suckering isn't dangerous. It's a maintenance headache, not a hazard — mowing over the same sprouts every couple of weeks, or cutting them back by hand, works for a while. But it's also the clearest practical argument for grinding rather than waiting: the stump still has the stored energy to keep pushing growth, and grinding it removes that energy source entirely, which is usually what actually stops the sprouting for good.
Sign 2: Mushrooms Growing From or Near the Stump
Mushrooms on an old stump are the most alarming-looking sign and, most of the time, the least urgent one. What you're seeing is the fruiting body of a fungus that's already been breaking the wood down for a while — the mushroom itself is just the visible, temporary part of an organism that lives mostly underground or inside the decaying wood. In most cases, that's simply decomposition doing its job, and it means the stump is on its way to becoming softer and easier to grind, not a sign that anything has gone wrong.
Where it's worth paying closer attention is a specific fungus called Armillaria, or honey fungus, which produces distinctive clusters of honey-colored mushrooms and is one of the more common root-rot organisms in this region. Armillaria doesn't stay confined to a single dead stump — it can spread through the soil and through root-to-root contact, which means an infected stump sitting near a living tree can, over time, become a source of infection for that tree too. The signal to watch for isn't the mushrooms on the old stump itself, but whether you're also seeing mushroom clusters or unusual dieback at the base of a nearby living tree. If you are, that's worth having an arborist look at rather than waiting — our guide to signs a tree needs to be removed covers what root-rot symptoms on a living tree typically look like.
The balanced version of this: mushrooms on a stump with no other trees nearby, or with no unusual symptoms on the trees you do have, are mostly a cosmetic and curiosity issue. Mushrooms on a stump sitting six feet from a tree you care about deserve a second look.
Sign 3: Sinking or Soft Soil Around the Stump
This is the sign that tends to bring the most questions, and it has the most straightforward explanation. Below the visible stump, the root system extends outward — often two to three times the width of the tree's former canopy — and as those roots decay over time, they leave small voids in the soil where solid root mass used to be. Rain and normal settling gradually collapse those voids, and the ground above dips. It's the same basic process as the depression that forms after a professional grinding job, just happening slowly and unevenly on its own instead of all at once.
In most cases, this is a gradual, minor cosmetic issue — a soft or slightly sunken patch that's more annoying to mow around than genuinely hazardous. But there are a few situations where sinking soil deserves more attention: if the depression is sudden or expanding quickly rather than gradual, if it's located near a foundation, patio, driveway, or walkway where a void underneath could eventually affect what's sitting on top, or if it's deep enough to twist an ankle or catch a mower wheel. A large old stump from a mature tree can leave a surprising amount of buried root mass behind, and in tight spots close to structures, it's worth having someone take a look rather than just topping it with soil and hoping it stops.
No Rush vs. Time to Book: Reading the Combination
None of these three signs is an emergency on its own, and taken together they're rarely more than moderately urgent — but reading them in combination tells you a lot more than any one sign alone. A few patterns worth knowing:
- Sprouts only, isolated stump, no other trees nearby: Low urgency. Grind whenever it's convenient — the main cost of waiting is a season or two of mowing around new shoots.
- Mushrooms on the stump, but no symptoms on nearby living trees: Low urgency. This is decomposition running its normal course. Grind on your own timeline, or use it as a sign the wood will grind easily.
- Mushrooms on the stump AND unusual dieback, thinning canopy, or fungal growth at the base of a tree you want to keep: Higher urgency. Root-rot organisms like Armillaria can spread between root systems in contact with each other, so this combination is worth a professional look sooner rather than later.
- Sinking soil that's gradual, shallow, and away from structures: Low urgency. Top-dress it with soil as part of normal lawn maintenance and grind whenever convenient.
- Sinking soil that's sudden, deep, or near a foundation, patio, or walkway: Higher urgency. Have it assessed — what's happening underground may be more extensive than a single decaying stump.
- All three signs on a stump within reach of kids, pets, or regular foot traffic: Worth prioritizing on safety grounds alone, independent of what the underlying decay means.
Kohnen's Tree Service provides free, in-person estimates specifically because these signals are easier to read on-site than described over the phone — Joe Kohnen, an ISA Certified Arborist, can typically tell you in a few minutes whether what you're seeing is routine decomposition or something that warrants a closer look at nearby trees.
What Booking Actually Involves
Once you've decided a stump is worth grinding, the process itself is straightforward. Stump grinding in our service area typically runs $100 to $400 per stump, depending mainly on diameter and how much surface root needs to come out with it — a small ornamental stump costs far less than a large removed shade tree. Grinding takes the stump down 4 to 6 inches below grade, which is enough for normal lawn restoration; the remaining root mass below that continues decaying on its own over the following years, the same natural process that caused the sinking soil in the first place, just now with the energy-storing stump gone and the sprouting stopped.
Before any equipment goes in the ground, we recommend a Kansas One Call locate (dial 811) if there's any question about what utilities run near the stump — standard practice on any job that disturbs soil. If your stump sits in a fenced backyard, most residential grinders need a gate opening of roughly 36 to 48 inches; tighter access is workable with the right equipment, and it's worth mentioning during your estimate so the right machine gets dispatched.
Frequently Asked Questions
Are mushrooms growing on an old stump dangerous? Usually not to you or your yard — they're a normal sign of wood decomposition. They're only worth extra attention if similar mushrooms or unusual dieback show up at the base of a living tree nearby, since some root-rot fungi can spread between trees in contact underground.
Will grinding the stump stop the sprouts for good? In most cases, yes. Sprouting is fueled by energy stored in the stump and root crown; grinding removes that reservoir, which typically stops new growth. Some very persistent species may send up a few isolated sprouts from distant roots the first season after, but they taper off without the main stump to draw on.
Why is the ground sinking around my old stump? As the buried root system decays underground, it leaves small voids that the soil above gradually settles into. It's the same process that creates the depression after a professional grinding job — just happening slowly and unevenly on its own. Gradual, shallow sinking away from structures is usually just a cosmetic lawn issue.
Can a diseased stump spread problems to my other trees? It can, mainly through root-rot fungi like Armillaria that travel through the soil or through direct root contact between trees. This is more of a concern when the stump sits close to a tree you want to keep, especially if that tree is already showing thinning canopy or dieback.
How long do stump roots take to fully decay if I don't grind? Smaller roots (1 to 3 inches in diameter) typically break down within a few years. Larger primary roots from a mature tree can take a decade or more. They're generally inert once decay is underway, but they'll continue producing the sprouting and settling issues covered above until the process finishes.
Getting a Read on Your Stump
A photo can rule out the obvious cases, but the difference between "grind it whenever" and "worth a closer look" usually comes down to details best assessed in person — how close the stump sits to other trees, how deep and how fast a sunken area is developing, whether nearby trees show any symptoms of their own. Kohnen's Tree Service is family-owned and owner-operated, fully insured, and backed by over 120 five-star Google reviews from homeowners across Wichita and the surrounding area. If you're weighing whether an old stump is part of a bigger decision — including whether a nearby tree needs more than a look — our full range of tree care services covers everything from routine pruning to full removal.
"Nine times out of ten, what people are worried about is just decomposition doing exactly what it's supposed to do. The one time out of ten where it matters is when there's a tree you care about standing nearby — that's the one I want to see in person."
— Joe Kohnen, Owner, Kohnen's Tree Service
We serve Derby and the rest of the Wichita metro within a roughly 40-mile radius, including Park City — where we're based on 61st Street — along with Bel Aire, Andover, Goddard, and Newton.
Not sure which category your stump falls into? Request a free in-person estimate online, or call (316) 207-4740. We respond the same day.