Unusually hardy to Zone 4; Rich lavender purple hose-in-hose flower on a vigorous upright plant. Blooms in May Moderate grower to 2 to 4 ft. tall, 3 to 5 ft. wide An unusually hardy and highly reliable evergreen shrub with rich lavender purple hose-in-hose flower on a vigorous upright plant. Foliage becomes burgundy in fall. Follow a regular watering schedule during the first growing season to establish a deep, extensive root system. Provide well drained soil, rich in organic matter. Feed with an acid fertilizer after bloom. Keep roots cool with a thick layer of mulch.