Tree stump grinding is a fast, efficient way to remove an unwanted tree stump — but what happens to the roots left behind in the ground? Do they decay? Do they grow back? Do you need to remove them too?
Let’s break it down.
What Is Stump Grinding, Exactly?
When a tree is cut down, the stump is the part that remains above ground, along with a system of roots beneath the soil. Stump grinding involves using a machine to shred the stump into wood chips — usually 4 to 16 inches below ground level.
However, stump grinding does not remove the roots. That’s important to understand.
So, What Happens to the Roots?
1. The Roots Begin to Decay Naturally
Once the stump is ground and the tree is officially “dead,” the roots no longer receive nutrients. Over time, they decay naturally underground. This process can take several years, depending on the size of the tree and root system, soil conditions, moisture, and climate.
In most cases, they don’t cause problems — they simply break down slowly like any organic material.
2. No, the Tree Won’t Grow Back (Usually)
In most cases, stump grinding kills the tree entirely, so regrowth is rare. However, some trees are very persistent — species like willows, maples, or poplars may try to sprout from remaining roots.
These are called suckers, and while they usually don’t grow into full trees again, they can be a nuisance. A little herbicide or regular mowing will handle them.
3. Roots Won’t Travel or Spread
Once the tree is dead, the roots stop growing. They won’t spread underground or invade your plumbing or foundation — that concern mostly applies to living trees. After grinding, they’re inert and shrinking, not expanding.
4. You Might Notice Settling or Sinkholes
As roots decompose, they leave behind air pockets in the soil. Over time, this may cause sinking or uneven spots in your lawn or garden. You can fix this by filling in with topsoil and reseeding grass as needed.
5. Fungus and Mushrooms Might Appear
Decaying wood in the soil can attract fungi — including mushrooms — especially in damp conditions. While these are mostly harmless and part of the decomposition process, they can look unpleasant or signal deeper decay.
If mushrooms or mold are a problem, you can:
- Remove the wood chips and replace with clean soil
- Apply fungicide (only if necessary)
- Rake and dry out the area
6. It’s Okay to Plant New Things — With Caution
You can plant grass, flowers, or even another tree in the same area — but give it some time first. Decomposing roots can change the soil pH or nutrient balance. Also, leftover wood chips may compete for nitrogen, which young plants need.
Tips:
- Wait a few months before planting
- Remove as many wood chips as possible
- Mix in compost or fresh topsoil
Can You Remove Tree Roots After Grinding?
Yes, but it’s usually not necessary unless:
- You’re installing a structure like a patio, shed, or driveway
- The roots are interfering with underground utilities
- You want to replant immediately
Root removal is more labor-intensive and often involves digging or using a mini-excavator. It can cost significantly more than stump grinding alone.
Should You Be Concerned About Leftover Roots?
Not really. For most homeowners, leaving roots to decompose naturally is totally fine. If you’re not planning construction or new landscaping in that exact spot, the decaying roots won’t bother anyone.
If you’re unsure, call a local arborist or stump removal expert to assess your specific case.
In a Nutshell:
- Roots stay in the ground after stump grinding.
- They will decompose over several years.
- Regrowth is rare but possible in a few aggressive tree species.
- Mushrooms and settling soil can occur, but they’re manageable.
- You can plant again — just prepare the soil properly.y
Related Post:
https://arboristmemorial.com/what-happens-to-roots-after-stump-grinding
FAQs
1. How long does it take for roots to decay after stump grinding?
Anywhere from 3 to 10 years, depending on tree type, soil conditions, and climate.
2. Will the roots cause damage after grinding?
No, dead roots won’t grow or damage plumbing or foundations.
3. Can I replant a tree in the same spot?
Yes, but wait a few months and amend the soil before replanting.
4. Will mushrooms grow where the stump was ground?
Possibly — they’re part of the natural decay process and are usually harmless.
5. Do I need to remove roots after stump grinding?
Not unless you’re planning construction or aggressive replanting. Most people leave them to rot naturally.
