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Alpine RockeryHerbaceous PerennialSynonym

Persicaria affinis 'Darjeeling Red'
  • RHS AGM
  • RHS Plants for pollinators

knotweed 'Darjeeling Red'

A semi-evergreen perennial to 25cm tall, forming a mat of lance-shaped leaves to 15cm long, often becoming red in autumn; in summer dense spikes of small flowers open pink, becoming dark red when mature

Synonyms
Persicaria affinis 'Darjeeling Red'
Polygonum affine 'Darjeeling Red'

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Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Clay
Loam
Sand
Moisture
Moist but well–drained, Poorly–drained, Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Pink Red Green
Autumn Pink Red Green
Winter Green
Position
  • Full sun
  • Partial shade
Aspect

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

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

A genus of herbaceous, rhizomatous perennials with erect, unbranched stems, bearing short terminal spikes of small, white or pink, bell-shaped flowers

Name status

Accepted

How to grow

Cultivation

Prefers moisture retentive soil in sun or part shade but may spread quickly in wet soil. It is tolerant of dry and light soils in sun or shade where it will spread more gradually

Propagation

Propagate by division in spring or autumn, or stem-tip cuttings of non flowering shoots

Suggested planting locations and garden types
  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Gravel garden
  • Patio and container plants
  • Rock garden
  • Garden edging
  • Flower borders and beds
  • Ground cover
Pruning

No pruning required but remove spent flowers if necessary and comb out old leaves

Pests

Generally pest-free

Diseases

Generally disease-free

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