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Thalictrum aquilegiifolium 'Thundercloud' AGM

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© RHS 1999

Characteristics

Plant type

Herbaceous Perennial

Habit

Clump-forming

Toxicity

Contact with foliage may irritate the skin

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

Purple in Summer

Foliage

Green in Autumn, Spring and Summer

Size

Ultimate height

0.5-1 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

rue 'Thundercloud'

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

'Thundercloud' is an erect herbaceous perennial to 90cm in height, with mid-green leaves composed of small, obovate leaflets, and branched stems bearing large fluffy heads of small flowers with prominent deep rose-purple stamens in early summer

Synonym(s)

  • Thalictrum aquilegiifolium PURPLE CLOUD
  • Thalictrum aquilegiifolium 'Purple Cloud'
  • Thalictrum delavayi 'Thundercloud'

How to grow

Sunlight

  • Part shade

Aspect

  • East-facing
  • Sheltered

Cultivation

Grow in moist, humus-rich soil in partial shade

Soil

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

Propagation

Propagate by seed in pots in a cold frame as soon as seed is ripe or in early spring. Propagate by division in spring as new growth begins

Suggested planting locations and garden types

City/Courtyard Gardens, Cottage/Informal Garden, Flower borders and beds, Low Maintenance, Prairie Planting, Underplanting of Roses and Shrubs or Wildflower meadow


How to care

Pruning

Cut down stems once flowering is over

Pests

Slugs may be a problem

Diseases

May be subject to powdery mildews in dry conditions