QuestionsHow to growFlowersBorder Perennial FlowersWhat is it? 0 Vote Up Vote Down Patricia Monaghan asked 10 years ago Can you name this plant? They are sprouting out of the ground in my son’s garden 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago This is red valerian, Centranthus ruber, a garden plant from southern Europe, that self-sows mainly on old masonary walls.