wrote in message
oups.com...

There are 2 trees whose roots are lifting the concrete pretty high.
She has been told that she needs to get rid of the trees and that there
is a "special something" that needs to be applied on the cut trunk
...or something...

Would anyone know what needs to be applied to the cut trunk to
permanently kill the trees?

Essential information is omitted here. Chemicals can be used
either to suppress sprouting from the cutoff trunk or to accelerate
decay of the roots (which takes years).

Can anyone suggest a better way to get rid of these 2 trees ?

"Removal" means cutting down the tree, recutting the trunk at
ground level, and removal of debris. This is expensive. The main
alternative is to for the householder to do the job himself.

What do people normally do when the roots of a tree lift the concrete ?

They usually remove the tree, as recommended to this householder.

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)