A pretty bicolour flower of white tubular petals surrounding vivid purple centres in early summer. The silvery-green foliage forms dense clumps. Likes as well drained alkaline or neutral soil. Remove spent blooms to encourage further successions of flowers. Attractive to bees and butterflies. Cut back in autumn,divide in autumn if congested, do not allow the soil to become water-logged in winter months, a little grit when planting will help if unsure of conditions. Fully hardy perennial.