In message , Franz Heymann
writes

"Brian Watson" wrote in message
...

[snip]

Plan B: lop 'em off at ground level, drill the remaining stumps, and
pour in
root-rotting crystals.

That sounds like magic. What are these crystals made of?

Ammonium sulphamate. Active ingredient of "Rootout" and some others.

Don't get it on your fingers. Moderately effective. I have also been
told that a trace of copper sulphate will accelerate wood decay in the
ground by inhibiting an enzyme that protects wood from attack. I have
never tried this as my worst tree stump yielded to brute force earlier
this year.

Regards,
--
Martin Brown