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Persicaria bistorta 'Superba' AGM

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© RHS

Characteristics

Plant type

Bog or Herbaceous Perennial

Habit

Clump-forming

Resilience

Hardiness

H7 (very hardy)

Colour

Flower

Pale Pink and Pale Red in Autumn and Summer

Foliage

Green in Autumn, Spring, Summer and Winter

Size

Ultimate height

0.5-1 metres

Ultimate spread

0.5-1 metres

Time to ultimate height

2-5 years


Preferred common name

red bistort 'Superba'

Family

Polygonaceae


Persicaria can be annuals, herbaceous or evergreen perennials or sub-shrubs with simple leaves and small bell-shaped white or pink flowers in long-lasting spikes or panicles

'Superba' is a vigorous clump-forming herbaceous or semi-evergreen perennial to 90cm in height, with strongly veined, finely pointed ovate leaves and dense spikes of small light pink flowers

Synonym(s)

  • Polygonum bistorta 'Superbum'

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, East-facing or West-facing
  • Exposed or Sheltered

Cultivation

Ideal for a moist soil although it can tolerate some dryness; copes in full sun or partial shade

Soil

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

Propagation

Propagate by division in spring or autumn

Suggested planting locations and garden types

Banks and Slopes, Coastal, Cottage/Informal Garden, Flower borders and beds or Wildflower meadow


How to care

Pruning

Deadhead faded spikes

Pests

Generally pest free

Diseases

Generally disease free