Five honest options for getting rid of a tree stump — chemical, mechanical, and the burning method most articles skip the legal warning on. Real timelines, real costs, and what makes sense in Wisconsin.
Search "how to kill a tree stump" and you'll get a hundred articles pushing Epsom salt, potassium nitrate, or copper sulfate. Most of those articles are written by content farms that have never tried the methods in Wisconsin's climate. We've ground up dozens of stumps that homeowners had been "killing" with chemicals for two years. Here's the honest comparison.
| Method | Cost | Time | Removes stump? | Wisconsin legality |
|---|---|---|---|---|
| 1. Epsom salt | $8–$15 | 6–18 months | No (just rots) | Legal everywhere |
| 2. Potassium nitrate | $15–$30 | 4–8 months | No (just rots) | Legal but restricted |
| 3. Copper sulfate | $10–$25 | 3–6 months | No (kills roots only) | Banned near shoreland |
| 4. Burning | $5–$50 | 1–3 days | Mostly | Illegal in most WI cities |
| 5. Stump grinding | $150–$600 | 15–60 minutes | Yes (same day) | Legal everywhere |
Drill 1-inch holes 8 inches deep across the stump top. Fill with Epsom salt. Cover with tarp or wax to keep rain out. Salt draws moisture from the wood, accelerating decay. Doesn't actually "kill" — speeds up natural rot.
Sold as "Stump Remover" at hardware stores (brands like Spectracide, BioAdvanced). Same drilling protocol as Epsom salt — pour granules in, add water, cover. Faster than Epsom salt because potassium nitrate accelerates fungal decay.
Apply to fresh-cut stump or pour into drilled holes. Kills the root system aggressively, preventing regrowth. Most effective on stubborn-sprouting species.
Drill holes, fill with kerosene or charcoal, ignite, let smolder. Stump burns down to ash over hours or days.
A self-propelled stump grinder with a carbide-toothed cutting wheel grinds the stump down to 4–8 inches below grade. The stump becomes wood chips on-site (free mulch or hauled away for $40–$80). Roots that are no longer connected to a living trunk decompose naturally over 5–10 years.
Every chemical method on this list (Epsom salt, potassium nitrate, copper sulfate) accelerates decay or kills the root system — but the stump itself still has to physically rot away over 5–10 years. During those years, the stump:
If your goal is a clean yard you can plant grass or a new tree in within weeks, chemical methods don't deliver that. Grinding does. That's the honest tradeoff: $10–$30 and 12 months of waiting + a still-rotting stump, vs. $150–$600 and a clean planting bed today.
Mechanically: stump grinding finishes the job in 15–60 minutes for a typical residential stump and physically removes the stump from the yard. Chemically: copper sulfate kills the root system in 3–6 months, but the stump still needs to physically rot away (another 5–10 years). Burning is fast when legal but illegal in most Wisconsin municipalities. For most homeowners in Lake Country, grinding is the only method that delivers a clean yard same-day.
Sort of. Epsom salt is magnesium sulfate, which draws moisture from the wood and accelerates natural decay. It doesn't directly "kill" the stump in the way a herbicide does — it speeds up rot. Effective on freshly-cut, already-dying stumps in dry climates, less effective on green Wisconsin hardwoods or stumps in shaded wet areas. Realistic timeline: 12–24 months for visible decay. The stump still won't disappear — it just gets soft enough to break apart with a shovel.
In most cases, yes. Wisconsin's open-burning rules (DNR NR 429) restrict burning of "construction debris" and "yard waste" without a permit, and most Lake Country municipalities (Oconomowoc, Pewaukee, Hartland, Delafield, Waukesha) prohibit open burning year-round in residential zones. Some rural townships allow it with a permit during certain seasons. Always check your local ordinance before burning anything. Penalties for illegal burning range from $200–$5,000 plus DNR-assessed cleanup costs.
In Wisconsin: 5–10 years for hardwoods (oak, maple, hickory) and 3–5 years for softwoods (pine, willow, cottonwood). Cottonwood, willow, and silver maple decay fastest. Oak and ironwood decay slowest. Climate affects timeline — wet, shaded conditions speed decay; dry, sunny conditions slow it. Throughout the decay period, the stump attracts pests (carpenter ants, termites, yellowjackets) and remains a tripping hazard.
Yes, somewhat. Drilling 1-inch holes 8–12 inches deep across the top of the stump increases surface area for fungi and water to penetrate. Fill the holes with high-nitrogen fertilizer (cheaper than commercial stump remover, similar effect), keep moist, cover with a tarp. Realistic acceleration: 30–50% faster decay vs. doing nothing. Still measured in years, not months. Doesn't remove the stump, just speeds up rot.
Cheapest if you have time: do nothing — let it rot naturally (5–10 years). Cheapest with effort: drill + Epsom salt or potassium nitrate ($10–$30 in materials, 12–24 months). Cheapest if you want it done: hire stump grinding ($150–$300 for typical residential). DIY rental is rarely cheapest once you add the truck rental, fuel, dump fees, and your time — see our cost breakdown comparing rental vs. hiring Lake Country Stump Grinding.
If you're tired of waiting on Epsom salt to do its thing, hiring Lake Country Stump Grinding turns the project into a 30-minute visit. $150–$300 for typical residential stumps, written quotes within an hour, jobs scheduled within 2–5 days.
Most quotes back within 1 business hour, 7am–7pm Mon–Sat. We'll text you a price estimate.
Last updated: May 7, 2026.
