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

• Position: full sun
• Soil: well-drained, fertile soil
• Rate of growth: average
• Flowering period: July to October
• Hardiness: frost hardy (may need winter protection)
  
  Chunky spikes of deep violet-blue flowers appear over a long period from midsummer attracting a host of beneficial insects, so it's perfect for a wildlife-friendly garden, while the rich green insects, so it's perfect for a foliage, which releases its liquorice-like aroma when gently bruised, makes it valuable for sensory gardens.
  
  
• Garden care: Don't cut back the faded flower-stems until early spring, as they provide interest in the winter months. Lift and divide congested colonies in spring.