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

• Position: full sun or partial shade
• Soil: fertile, well-drained soil
• Rate of growth: fast
• Flowering period: August to September
• Hardiness: fully hardy
  
  Producing a profusion of lavender-blue daisy flowers with yellow centres, this mildew-resistant aster starts flowering in late summer. This hybrid is a particularly useful plant, which will usually bloom well in dry and shady corners.
  
  
• Garden care: Leave top growth on through the winter to provide protection and valuable food for birds and insects. Insert twiggy prunings early in the season to provide invisible and effective support. Apply a thick 5-7cm (2-3in) mulch around the base of the plant in the autumn, taking care not to cover the crown.