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Persicaria affinis 'Darjeeling Red' AGM

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© RHS

Characteristics

Plant type

Herbaceous Perennial or Alpine/Rockery

Habit

Mat forming

Toxicity

Contact with all parts may irritate skin; the sap may cause mild stomach upset if ingested

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

Pink and Red in Autumn and Summer

Foliage

Green in Autumn, Spring, Summer and Winter

Size

Ultimate height

0.1-0.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

knotweed 'Darjeeling Red'

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

'Darjeeling Red' is 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

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

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

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

Soil

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

Propagation

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

Suggested planting locations and garden types

City/Courtyard Gardens, Coastal, Cottage/Informal Garden, Flower borders and beds, Garden Edging, Gravel Garden, Ground Cover, Rock Garden or Patio/Container Plants


How to care

Pruning

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

Pests

Generally trouble free

Diseases

Generally trouble free