This showy plant makes a wonderful display; free flowering with many large dense umbels of deep blue flowers held on tall dark stems. A very showy perennial forming strong clumps and flowering in summer.The plant likes a sunny situation with moist but well drained soil. It is hardy in most areas, dying back to bulb form in winter. Ideal for garden planting, or to feature in a patio container. Plants can be propagated by division in spring. Apply high nitrogen garden fertilizer to promote initial growth; once established use a flowering plant fertilizer. Height 80 to 100cm.