Description
Medium-sized, clump-forming, bushy deciduous perennial (H 70-90 cm, W 80-100 cm). Leaves broadly lanceolate to heart-shaped (35-40 cm), longitudinaly ribbed, hard, dark grey-green. Flowers in clusters on upright stems, simple (2 cm), light lilac-violet. Flowering period: July-August. A good ground-covering perennial for shade and semi-shade, needs nutrient-rich and always moist soils.