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Herbaceous PerennialBogsSynonym

Persicaria affinis 'Superba'
  • RHS AGM
  • RHS Plants for pollinators

knotweed 'Superba'

A semi-evergreen perennial forming a wide mat to 20cm in height, with dark green, elliptic leaves and erect spikes of small pale pink flowers that deepen to crimson with age

Synonyms
Polygonum affine 'Superbum'
Persicaria affinis 'Dimity'
see morePolygonum affine 'Dimity'
Persicaria affinis 'Superba'
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Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
5–10 years
Ultimate spread
0.5–1 metres
Growing conditions
Clay
Loam
Moisture
Moist but well–drained, Poorly–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Pink Red Green
Autumn Pink Red Green Bronze
Winter Green
Position
  • Full sun
  • Partial shade
Aspect

South–facing or North–facing or West–facing or East–facing

Exposure
Exposed or Sheltered
Hardiness
H7
Botanical details
Family
Polygonaceae
Native to the UK
No
Foliage
Semi evergreen
Habit
Matforming
Name status

Accepted

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How to grow

Cultivation

Grow in any moist soil in full sun or partial shade

Propagation

Propagate by division in spring or autumn

Suggested planting locations and garden types
  • Rock garden
  • Cottage and informal garden
  • Flower borders and beds
  • Garden edging
  • Ground cover
Pruning

Cut back after flowering

Pests

Generally pest-free

Diseases

Generally disease-free

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