Has anybody successfully killed a tree using the "drill holes and put salt in it" method -- we bought our house in April and there was a tree planted too close to the house, so we had it cut down to a stump (didn't want to remove the roots because it might affect the foundation of the house) but now the tree's roots are sprouting all over the front yard. I keep removing them but it seems like it might not be dying if it's sprouting up, and I know there's at least some roots growing under the house because they're coming through one of the ventholes to reach the sun... any suggestions? Should I start digging up the roots I can find and remove them manually? Thanks... Marc