It forms a compact, upright clump of glossy green, thick and strappy leaves which emit a slight smell of onion when crushed. In early-mid summer a profusion of large 2”, bright rosy purple, tightly rounded clusters of flowers appear on strong stems just above the attractive foliage. Butterflies and honeybees adore the flowers' sweet nectar but deer and rabbits steer clear of this perennial beauty. This plant has not been known to reseed in the landscape and is very easy to grow.