Verbena bonariensis

verbena

• Position: full sun
• Soil: moderately fertile, moist, well-drained soil
• Rate of growth: average to fast-growing
• Flowering period: June to September
• Hardiness: borderline hardy

  
  Tightly packed clusters of lilac-purple flowers on tall, stiff, branching stems from June to September. This stylish perennial has been enjoying a resurgence of interest in recent years. Perfect for a sheltered, sunny, well-drained spot, its open, transparent shape means that it can easily be used at the front or middle of the border despite its height.
  

• Garden care: In cold conditions Verbena bonariensis can suffer dieback if cut back in autumn, so it's best to leave the plant until spring and cut back the old growth when you see the new shoots emerging at the base. Also it's a good idea to mulch around the base of the plant with a deep, dry mulch in winter to help protect the plant. Where the plant is grown in partial shade the stems may need to be supported - if this is necessary use natural materials such as brushwood or twiggy pea-sticks.