This perennial is semi-evergreen so it can lose some of its leaves in winter. In colder regions or more exposed gardens, it may lose them all, but then fresh new growth appears again in spring.

• Position: full sun
• Soil: dry, well-drained, poor to moderately fertile soil
• Rate of growth: average
• Flowering period: July to August
• Hardiness: fully hardy
  
  Thistle-like cones of bright blue flowers are surrounded by a ruff of spiky bracts, which turn from silvery blue at their base to gold at their tips. These form on blue stems that are clothed with yellow foliage, so the overall effect is quite colourful. This is a sun-loving plant that can be used in herbaceous borders or prairie-style planting schemes. The flowerheads are long-lasting and can be dried and added to arrangements.
  
  
• Garden care: Lift and divide large colonies in spring. Avoid the temptation to cut back the flower-heads in autumn as they provide interest in the winter garden.