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Verbena bonariensis AGM

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© RHS

Characteristics

Plant type

Herbaceous Perennial

Habit

Columnar/Upright

Fragrance

Flower

Resilience

Hardiness

H4 (hardy - average winter)

Colour

Flower

Purple in Autumn and Summer

Foliage

Green in Autumn, Spring and Summer

Size

Ultimate height

1.5-2.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

purple top

Family

Verbenaceae


Verbena can be annuals, perennials or sub-shrubs, with toothed or pinnately lobed leaves and small salver-shaped flowers in spikes, panicles or corymbs in summer or autumn

V. bonariensis is a tall perennial with erect, branching stems to 2m in height, bearing sparse, oblong leaves and large branched clusters of small, purple flowers from summer to autumn

Other common names

  • Argentinian vervain
  • South American vervain
  • tall verbena

Synonym(s)

  • Verbena bonariensis 'Buenos Aires'
  • Verbena brasiliensis misapplied
  • Verbena patagonica

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing
  • Exposed

Cultivation

Grow in moist but well-drained or well-drained, moderately fertile soil in full sun. In cold areas, protect with a dry winter mulch

Soil

  • Moist but well-drained or Well-drained
  • Acid, Alkaline or Neutral
  • Clay, Loam, Chalk or Sand

Propagation

Propagate by seed in pots at 18-21°C in autumn to early spring or let it self-seed

Suggested planting locations and garden types

Flower borders and beds, Prairie Planting or Gravel Garden


How to care

Pruning

Cut down once flowering ceases

Pests

Generally pest free

Diseases

Generally disease free