Potassium nitrate stump remover speeds up natural decay by feeding the fungi and bacteria that break down wood. Pour about 1 pound into deep drilled holes, soak with water, and the stump usually softens enough to break apart in 4 to 6 weeks.
Want to compare chemical removal with hiring a grinder? See typical prices on our stump grinding costs homepage.
How potassium nitrate works
Potassium nitrate supplies nitrogen that wood-rotting fungi and bacteria need. With steady moisture, they break down the wood far faster than they would on their own.
How to use it
- Drill 1-inch holes 8 to 12 inches deep.
- Pour in the granules.
- Fill the holes with water.
- Cover the stump and keep it moist.
- Break up the soft wood after 4 to 6 weeks.
Full steps: how to rot a stump fast.
Products
Best overall
Spectracide Stump Remover
- Potassium nitrate granules
- 1 lb container
Keep reading
-
DIY How to Rot a Tree Stump Fast How to make a tree stump rot faster with potassium nitrate, water, nitrogen and a tarp. Timelines, costs and what to do once the stump is soft. -
DIY Best Stump Removers The best stump removers for softening and rotting tree stumps in 2026: potassium nitrate granules, stump killers for regrowth and the tools to apply them. - DIY Chemical Stump Removal: Step-by-Step How to remove a tree stump with chemicals: drilling, applying potassium nitrate, timing, safety and costs. Plus when grinding is a better choice.
Browse all stump guides or go back to the stump grinding costs homepage.
Frequently asked questions
Does potassium nitrate really remove stumps?
It does not dissolve wood instantly. It speeds up decay so the stump becomes soft and easy to break apart.
How much potassium nitrate do I need for a stump?
About 1 pound treats one or two average stumps. Follow the product label for larger stumps.
How long does potassium nitrate take to work on a stump?
Usually 4 to 6 weeks, and longer for large hardwood stumps or in cold weather.
Is potassium nitrate the same as Spectracide Stump Remover?
Yes. Spectracide Stump Remover and Bonide Stump-Out are both potassium nitrate granules.
Is potassium nitrate safe around pets and kids?
Keep children and pets away from treated stumps, wear gloves and follow the label.
Can potassium nitrate harm nearby plants?
Used as directed inside drilled holes, it has little effect on nearby plants.
Can I burn a stump after using potassium nitrate?
Potassium nitrate is an oxidizer and makes wood burn hotter. Many areas ban stump burning, so check local rules first.
How much does potassium nitrate stump remover cost?
About $10 per pound for common brands.
Sources and methodology
Last updated . Prices are estimates built from published contractor rates, national cost guides and federal labor data. Read how we calculate prices.