QuestionsHow to growTrees and ShrubsPruningPoplar suckers 0 Vote Up Vote Down Iris Doherty asked 9 years ago We cut down a large variegated Poplar a few months ago as it was rather too close to an old barn. There are lots of suckers rising from the roots which are near the surface and I was wondering how we can get rid of these. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago Cut the suckers close to the ground and dap each one with some undiluted Roundup with a small paintbrush. Repeat if necessary in summer.