--- title: "Does Stump Killer Work? What Extension Sources Say" description: "Does stump killer work? Extension sources say herbicide can reduce resprouting on a fresh cut but does not remove a stump. Follow the product label." url: https://cincystump.multisites.ai/guides/does-stump-killer-work publisher: Cincinnati Stump Grinding phone: +1-513-587-6772 quote: https://cincystump.multisites.ai/contact --- # Does stump killer work, and what does it actually kill? Stump killer can reduce resprouting when it goes on a freshly cut stump. It does not make the stump disappear. Iowa State Extension says herbicides are not beneficial for promoting decay, and commercial stump removal products tend to be a form of fertilizer. Follow the product label. GuideUpdated October 26, 20264 min read ## It targets sprouts Extension pages describe herbicide as a way to reduce resprouting, not to remove the stump. ## Not a rotting aid Iowa State says herbicides are not beneficial for promoting decay of the stump. ## Timing and tissue matter Apply to the living layer just under the bark, right after cutting, and not in spring sap flow. ## The label rules Every extension source here says to mix and apply as the product label directs. ## Does stump killer work? It works on one job: reducing sprouts from a freshly cut stump. It does not remove the stump. Iowa State Extension says “while herbicides can be used to prevent resprouting, they are not beneficial for promoting decay of the stump.” The stump stays until it rots or someone removes it, for example by [stump grinding](https://cincystump.multisites.ai/glossary/stump-grinding). The term “[stump killer](https://cincystump.multisites.ai/glossary/stump-killer)” covers two different kinds of product, and the sources treat them differently. Fertilizer-type products aim to speed rot. Herbicide-type products aim to stop regrowth. Iowa State says some products contain a herbicide. Read the label to see which kind you have. Product type What it aims to do What Iowa State Extension says Herbicide on a fresh cut Reduce resprouting Can help reduce resprouting Fertilizer-type “stump remover” Speed rot “Tend to simply be a form of fertilizer (often potassium or sodium nitrates), so regular fertilizers can work just as well” Herbicide poured in drilled holes well after cutting Rot the stump Not beneficial for promoting decay ## What is in commercial stump removal products? Iowa State Extension says these products “tend to simply be a form of fertilizer (often potassium or sodium nitrates).” It adds that “some of the products will also contain a herbicide, such as triclopyr, glyphosate, or imazapyr, to help prevent resprouting.” Its instruction is to “use these products as directed to prevent damage to nearby plants.” That means the product label. Illinois Extension names potassium nitrate, also called saltpeter, as a common ingredient and says to follow the label directions. Citing a University of Georgia researcher, it says chemical treatment speeds up decomposition by about 25 percent, while enhancing natural decay can accelerate it by up to 50 percent. See [Does Epsom salt rot a stump?](https://cincystump.multisites.ai/guides/does-epsom-salt-rot-a-stump) for a related claim. ## When and how do extension pages say to use herbicide on a stump? Only while the cut is fresh, and always as the product label says. These steps are as the sources state them. They are not a substitute for the label. 1. **Cut the tree or shrub.** The treatment goes on a fresh cut surface. Penn State says to use a backpack sprayer, pump-up spray bottle or trigger sprayer, and to mix “according to label directions.” 2. **Clean the surface.** Iowa State says to “be sure to clean off any sawdust or soil before the application.” 3. **Treat the living layer.** Iowa State: “Herbicides only need to be applied to the living cambium tissue, which is in a ring just below the bark.” Penn State says for water-soluble products on stumps four inches or larger, treat the living tissue “immediately after cutting.” 4. **Pick the right season.** Penn State says “treatments in late summer and fall are preferred” and that spring sap flow makes them ineffective. Ohio State’s honeysuckle sheet says late summer, early fall or dormant-season applications have all been effective and to avoid sap flow in spring. 5. **Watch for sprouts and retreat.** Iowa State says “if sprouts appear after the herbicide application, cut the sprouts and reapply the herbicide,” and to repeat until sprouts stop. Penn State says to “monitor stumps for sign of resprouts after initial treatment, and retreat as necessary.” The Ohio State sheet is about bush honeysuckle, a woody shrub, not every tree. It still gives a clear statement: “Label recommendations must be followed to maximize the potential for successful control.” See [Honeysuckle stumps and roots](https://cincystump.multisites.ai/guides/honeysuckle-stumps-and-roots) and [How to kill honeysuckle roots](https://cincystump.multisites.ai/guides/how-to-kill-honeysuckle-roots). The glossary entry for [cut stump treatment](https://cincystump.multisites.ai/glossary/cut-stump-treatment) explains the method. ## Does it work on an old stump or after grinding? Not as a stump remover. Iowa State Extension says “any herbicide poured into drilled holes or over the stump well after the tree’s removal will only leach into the soil and potentially damage nearby plants.” After grinding there is no fresh cut to treat, and the hole holds [wood chips](https://cincystump.multisites.ai/glossary/wood-chips). If sprouts appear, Purdue Extension (which links them to roots that store energy for the tree) says “simply treat them with typical lawn herbicide as needed at the label recommended rates.” Penn State and Iowa State describe cutting and retreating for repeated sprouts. See [Will a stump grow back?](https://cincystump.multisites.ai/guides/will-a-stump-grow-back). ## Is stump killer safe? Herbicides can harm plants you want to keep, so the label comes first. Iowa State warns against products with picloram (Tordon): “this herbicide easily leaches and remains active in the soil for a long time, causing a lot of collateral damage in the garden.” The Ohio State honeysuckle sheet lists picloram products for woodland honeysuckle, so label rules and site matter. We give no advice beyond the sources. Follow the product label, and for a stump near a tree you want to keep, ask a licensed applicator or an ISA Certified Arborist first. ## What other options exist? Extension sources list several. Iowa State’s page covers grinding, natural decay with drilled holes and fertilizer, digging, and leaving the stump for wildlife. It lists burning as a method to avoid. Read [Can you burn a tree stump?](https://cincystump.multisites.ai/guides/can-you-burn-a-tree-stump), [DIY stump removal vs hiring a pro](https://cincystump.multisites.ai/guides/diy-stump-removal-vs-hiring-a-pro) and [Stump grinding vs stump removal](https://cincystump.multisites.ai/guides/stump-grinding-vs-stump-removal). The pillar [Tree roots, stumps and regrowth](https://cincystump.multisites.ai/guides/tree-roots-stumps-regrowth) ties them together. Iowa State calls professional grinding “the quickest, easiest, and safest way to remove a tree stump.” The drawback it names is cost. Cincinnati Stump Grinding grinds tree stumps in Dayton, Cincinnati and Northern Kentucky. See [Stump grinding cost](https://cincystump.multisites.ai/guides/stump-grinding-cost) for reported prices. ## Next step To skip the chemicals and have the stump ground out, see the [stump grinding service](https://cincystump.multisites.ai/services/stump-grinding). Call (513) 587-6772 or [send photos for a free estimate](https://cincystump.multisites.ai/contact). ## Frequently asked questions ### Does stump killer work? It can reduce resprouting when applied to a fresh cut. Iowa State Extension says herbicide on the stump right after cutting can help reduce resprouting, but is not beneficial for promoting decay. Stump killer does not make a stump disappear. ### What is in stump killer? Iowa State Extension says commercial stump removal products tend to simply be a form of fertilizer, often potassium or sodium nitrates. Some also contain a herbicide such as triclopyr, glyphosate or imazapyr to help prevent resprouting. Read the product label. ### When should I apply stump killer? Penn State Extension says treatments in late summer and fall are preferred and that spring treatments are rendered ineffective by upward sap flow. Iowa State says apply to the stump right after cutting. Follow the product label. ### Does stump killer work on an old stump or after grinding? Iowa State says herbicide poured on a stump well after the tree's removal will only leach into the soil and potentially damage nearby plants. For sprouts after grinding, Purdue says to treat the sprouts at the label recommended rates. ### Is stump killer safe for the lawn and nearby plants? Iowa State says to use these products as directed to prevent damage to nearby plants, and warns that one herbicide, picloram, leaches easily and stays active in soil. Follow the product label. ## Terms on this page - [ISA Certified Arborist](https://cincystump.multisites.ai/glossary/isa-certified-arborist) - [Stump grinding](https://cincystump.multisites.ai/glossary/stump-grinding) - [Natural decay](https://cincystump.multisites.ai/glossary/natural-decay) - [Stump removal](https://cincystump.multisites.ai/glossary/stump-removal) - [Stump killer](https://cincystump.multisites.ai/glossary/stump-killer) - [Honeysuckle](https://cincystump.multisites.ai/glossary/honeysuckle) - [Resprouting](https://cincystump.multisites.ai/glossary/resprouting) - [Wood chips](https://cincystump.multisites.ai/glossary/wood-chips) ## Sources 1. [Iowa State Extension: How to Remove Tree Stumps](https://yardandgarden.extension.iastate.edu/how-to/how-remove-tree-stumps) 2. [Penn State Extension: Cut Stump Herbicide Treatment](https://extension.psu.edu/cut-stump-herbicide-treatment) 3. [Ohio State University Extension: Controlling Non-Native Invasive Plants in Ohio Forests: Bush Honeysuckle (F-68)](https://cfaes.osu.edu/fact-sheet/controlling-non-native-invasive-plants-ohio-forests-bush-honeysuckle) 4. [Illinois Extension: What to do with that tree stump? A guide to tree stump removal](https://extension.illinois.edu/blogs/good-growing/2025-07-18-what-do-tree-stump-guide-tree-stump-removal) 5. [Purdue Extension: Question: Can I Plant Grass Over Newly Removed Stump](https://extension.purdue.edu/news/2021/06/Question-Can-I-Plant-Grass-Over-Newly-Removed-Stump.html) Written by Cincinnati Stump Grinding and checked against the sources above on October 26, 2026. City rules and product guidance change, so check the linked page before you act. ## Keep reading - [Does Epsom salt rot a tree stump?None of the extension pages we opened list Epsom salt as a stump treatment. They describe what does speed decay: drilled holes, nitrogen, moisture, aeration and a cover, which can bring a stump down in one to three years. Illinois Extension says chemical treatment adds about 25%.](https://cincystump.multisites.ai/guides/does-epsom-salt-rot-a-stump) - [Honeysuckle stumps and roots: why they grow back and how to stop themCutting bush honeysuckle at the base makes it sprout more stems, because the roots stay alive. Ohio State Extension says an effective plan kills both the stems and the roots. Common options are a herbicide on the cut stump, following the product label, or a University of Cincinnati botanist's black plastic cover.](https://cincystump.multisites.ai/guides/honeysuckle-stumps-and-roots) - [How to kill honeysuckle roots: the steps Ohio State, Kentucky and UC publishOhio State Extension says to kill both the stems and the roots, because cutting alone causes more sprouting. Its main options are herbicide on a fresh cut stump, a foliar spray, or a basal spray, always following the product label. A University of Cincinnati botanist covers cut stumps with black plastic instead.](https://cincystump.multisites.ai/guides/how-to-kill-honeysuckle-roots) - [What happens to tree roots after stump grinding, and will the stump grow back?Stump grinding removes the stump and large lateral roots, typically down 8 to 12 inches, according to Iowa State Extension. Smaller roots stay in the ground and rot over several years. Some trees send up sprouts from those roots. Termites and mushrooms around a stump are signs of decay, not of grinding.](https://cincystump.multisites.ai/guides/tree-roots-stumps-regrowth) - [DIY stump removal vs hiring a pro: what you take onDIY stump removal works for small stumps and patient owners. Digging suits stumps under about 12 inches, and decay takes one to ten or more years. A rented grinder throws debris up to 75 feet, per one operator manual. Hiring a pro trades money for time and lower risk.](https://cincystump.multisites.ai/guides/diy-stump-removal-vs-hiring-a-pro) - [Stump grinding cost: what shapes the price and what to askStump grinding cost depends mostly on stump width, measured at its widest point. Many pros price by the inch and add a minimum charge. Access, wood type, depth and cleanup change the total. Published guides show wide ranges, so a quote for your own stump is the only number that counts.](https://cincystump.multisites.ai/guides/stump-grinding-cost)