Posted: 08/03/2014 at 19:30
In part of my garden there are a couple of pink-flowered, purple-leaved cherry plums, Prunus cerasifera 'Pissardii'. They must be grafted, because loads of thorny suckers with white flowers have appeared near them. One corner has been neglected, and the suckers have achieved tree-like proportions. I cut them all down today, but I'm assuming that I can't use glyphosate stump killer on them as that might affect the trees. Am I right? Any ideas for controlling the suckers?