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Thalictrum delavayi 'Hewitt's Double' (d) AGM

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© RHS

Characteristics

Plant type

Herbaceous Perennial

Habit

Columnar/Upright

Toxicity

Contact with foliage may irritate the skin

Resilience

Hardiness

H7 (very hardy)

Colour

Flower

Pale Purple in Summer

Foliage

Blue and Green in Spring and Summer

Size

Ultimate height

1-1.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

Chinese meadow rue 'Hewitt's Double'

Family

Ranunculaceae


Thalictrum can be rhizomatous or tuberous perennials with ternately or pinnately divided, often attractive foliage, and panicles or racemes of small flowers with showy stamens and sometimes large colourful petal-like sepals

'Hewitt's Double' is an erect herbaceous perennial to 1.5m in height, with attractively divided leaves and tall panicles of long-lasting, rosette-like, double lilac-purple flowers

Synonym(s)

  • Thalictrum dipterocarpum 'Hewitt's Double' misapplied

How to grow

Sunlight

  • Part shade

Aspect

  • East-facing or West-facing
  • Sheltered

Cultivation

Grow in moist, humus-rich soil in partial shade. May need staking

Soil

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

Propagation

Propagate by division as new growth begins in the spring

Suggested planting locations and garden types

Cottage/Informal Garden, Flower borders and beds, Wildlife Gardens or Cut Flowers


How to care

Pruning

Cut down stems once flowering is over

Pests

Generally pest free

Diseases

May be subject to powdery mildews in dry conditions