We have had a big clump of cordylines in an area about 1/2m wide and 1.2m long, between a high right angled 3 layer brick wall and a concrete pool. The cordylines have cracked the brick wall (now being replaced at great expense) and although we have dug out many of the old roots, new plants keep appearing. I have been cutting these and painting them with concentrated Round-up but as fast as I poison them, new shoots appear. How can I rid myself of these damaging plants quickly and permanently?
- 18 Apr, 2010