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  • purple top
  • Eventual height: 2m
  • Eventual spread: 0.45m

Verbena bonariensis

purple top

RHS award of garden merit Perfect for pollinators
9cm pot £5.99
9cm pot £5.99
6 × 9cm pots £35.94 £17.97
Quantity

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

  • 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 (may need winter protection)

    For several months from midsummer, the tall, upright stems of this much-loved perennial are topped with clusters of tiny lilac-purple flowers. It is ideal for adding height without density, and it makes an excellent filler in the border, because its stiff stems will help support neighbouring plants that might otherwise need staking. Verbena bonariensis also mixes well with ornamental grasses, while its nectar-rich flowers will help sustain bees and butterflies well into autumn.

  • 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. It can self seed so if you don't want it spreading then trim off spent flowers before they go to seed.
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