This perennial dies back to below ground level each year in autumn, then fresh new growth appears again in spring.

• Position: cool shade or partial shade
• Soil: prefers humus-rich soils which do not dry out in summer
• Rate of growth: slow initially but with good spreading capacity
• Flowering period: June to July
• Hardiness: fully hardy
  
  Deep purple flowers with a white eye emerge in early-to-mid-summer. 'Harvington Evening Star', bred and named by Hugh and Liz Nunn at Harvington near Evesham, is a tuberous perennial, with broad, upright, green leaves.
  
  
• Garden care: Incorporate plenty of organic matter and add some mycorrhizal fungi (Rootgrow) when planting. In very cold areas apply a dry winter mulch such as bark.