Description
Medium-sized, upright, clump-forming, rhizomatous deciduous perennial (H 60-80 cm). Leaves narrow, linear (40-50 cm), smooth, green. Flowers in clusters on upright stems, large (5-7 cm), dark violet-blue. Flowering period: May. Withstands occasional drought, also suitable for moist and marshy soils and water's edge. Good for cutting.