Since they bloom on new wood, even if there is no die-back, cut them back to the ground every spring. Even where winters are mild enough for the stems to survive, prune severely to stimulate abundant growth on which flowers are borne. Reply
Since they bloom on new wood, even if there is no die-back, cut them back to the ground every spring. Even where winters are mild enough for the stems to survive, prune severely to stimulate abundant growth on which flowers are borne.