Best And Quickest Way To Kill Try Roots

[RedcarRacer70]

I had three trees cut down in my garden in October 2021. The stumps where ground level to the garden, but the roots are still visible in place. What is best and quickest way to kill of the root system. Thanks

[bookbinder]

https://www.hunker.com/13429490/how-to-kill-tree-roots-naturally

[Chipchopper]

What kind of tress are they ?
Some will resprout, some won't

[TantP]

This worked for me ( and no I don't work for the company nor am I trying to flog anything

https://www.wilko.com/sbk-tree-stump-killer-250ml/p/0478644?gclid=CjwKCAjw7cGUBhA9EiwArBAvovUa3dgM899XCYZewsoQaxQlsjT74cfH8mOPr23sRo2lFJ0DVFr-uBoCCDIQAvD_BwE&;gclsrc=aw.ds

[dannyk13]

Bore holes in them and pour in diesel oil.
https://wemowdallas.com/killing-tree-stumps-with-motor-oil-diesel/