2002 ISU Perennial Award for Best New Introduction! 'Purple Emperor' has very dark reddish-purple foliage and a semi-upright habit. It captures your attention from the moment the dusky purple leaves emerge in spring, and forms a solid substantial mass of foliage. In late summer, dusty rose flowers appear in large clusters atop the bright reddish-purple stems. These blossoms age to bronze in the fall.