• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Anemone × hybrida 'Whirlwind'

Japanese anemone 'Whirlwind'

Japanese anemone 'Whirlwind'

© RHS

  • Other common names Japanese anemone 'Whirlwind'

  • Family Ranunculaceae

  • Genus Anemone are herbaceous perennials with fibrous, rhizomatous or tuberous rootstocks, palmately lobed leaves and saucer-shaped, usually 5-petalled flowers

  • Details 'Whirlwind' is a tall suckering perennial with large leaves of three leaflets, and semi-double white flowers 6cm wide, with narrow, slightly rolled petals

Characteristics

  • Foliage Deciduous

  • Habit Suckering

  • Toxicity Ingestion may cause mild stomach upset

  • Hardiness

    Hardiness ratings

    All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

    • H1a - Under glass all year (>15C)
    • H1b - Can be grown outside in the summer (10 - 15)
    • H1c - Can be grown outside in the summer (5 - 10)
    • H2 - Tolerant of low temperatures, but not surviving being frozen (1 to 5)
    • H3 - Hardy in coastal and relatively mild parts of the UK (-5 to 1)
    • H4 - Hardy through most of the UK (-10 to -5)
    • H5 - Hardy in most places throughout the UK even in severe winters (-15 to -10)
    • H6 - Hardy in all of UK and northern Europe (-20 to -15)
    • H7 - Hardy in the severest European continental climates (< -20)

    H7

Colour

Sunlight

  • Full Sun

  • Partial Shade

  • Aspect South-facing or North-facing or West-facing or East-facing

  • Exposure Exposed or Sheltered

Soil

  • Sand

    Sand

  • Clay

    Clay

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureMoist but well-drained

  • SoilSand, Clay, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Will grow in any garden soil but avoid excessive winter wet, dislikes being moved around. Can spread rapidly once established

Propagation Propagate by division in early spring or autumn, or propagate by root cuttings

Suggested planting locations and garden types Flower borders and beds Low Maintenance Underplanting of Roses and Shrubs Cottage & Informal Garden

How to care

Pruning Cut back in late autumn

Pests Prone to slugs and caterpillars

Diseases Powdery mildews may be a problem

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