How to kill roots of a massive, really massive, giant strelitza tree that has just been chopped down and is reshooting. The giant strelitza roots have spread and heaved up a wall and part of a driveway both of which will have to be remedied. The problem is that only a few days after an arboriculturist chain sawed the trunks/stems down to the base new shoots are already emerging like green rockets. I asked for the stump to be ground out but, apparently, a stump grinder progress would be brought to a sticky halt by the plants going mushy.
I know that I need to dig the roots out when they're dead, but how to kill them first?
