Lychnis chalcedonica is a stiff and upright perennial and a real show stopper33 commonly known as maltese cross the clusters of scarlet star45shaped flowers top tall upright stems during midsummer bringing height and interest to the back of a sunny border lychnis chalcedonica thrives in a damp boggy environment and makes a great addition to a bog garden or the edge of a pond or stream this hardy perennial also holds an rhs agm height 120cm 404841 spread 30cm 401241