QuestionsHow to growFlowersBorder Perennial FlowersHow to get rid of Bear’s Breeches 0 Vote Up Vote Down Mary Crowley asked 16 years ago I have tried spraying the leaves with diluted washing up liquid before spraying with Roundup to no avail. How can I get rid of it or stop it invading other plants in a small bed. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago ANy plant will die if denied light, so you could cover it with black polythene until it dies. Or use Roundup at a higher rate, 5% solution of Roundup Biactive should do the trick