QuestionsHow to growTrees and ShrubsSuckersStubborn roots 0 Vote Up Vote Down Jes Lowndes asked 15 years ago We are trying to clear a bank to replant it. however are fighting a battle against lilac roots which are right through the bank. Is there a way to kill them or remove them in a easy way. so far digging, chain saw and pick axe are not the way. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Any tree or shrub cut to ground level and the cut surfaces painted with undiluted Roundup will die.