• AGM plants

    AGM plants have been through a rigourous 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

Geranium pyrenaicum 'Bill Wallis'

Mountain cranesbill 'Bill Wallis'

Mountain cranesbill 'Bill Wallis'

© � RHS

  • Other common names Mountain cranesbill 'Bill Wallis'

  • Genus Geranium can be annuals, biennials and perennials, herbaceous or evergreen, with rounded, usually palmately lobed or divided leaves, and lax inflorescences of rounded, 5-petalled flowers

  • Family Geraniaceae / Geraniaceae

  • Species 'Bill Wallis' is a rather lax, sprawling perennial to 30cm tall, with small, rounded, lobed leaves and open sprays of vivid purple flowers 2cm wide, from late spring to late autumn


  • Foliage Deciduous

  • Habit Bushy



  • Full Sun

  • Partial Shade

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

  • Exposure Exposed or Sheltered


  • Chalk


  • Chalk


  • Chalk


  • Chalk


  • MoistureWell-drained, Moist but well-drained

  • SoilSand, Loam, Chalk, Clay

  • pHAcid, Alkaline, Neutral


  • Ultimate height

    0.1-0.5 metres

  • Ultimate spread

    0.1-0.5 metres

  • Time to ultimate height

    2-5 years

How to grow

Cultivation Grow in moderately fertile well-drained soil in full sun or partial shade. Most soils (unless waterlogged) in either sun or shade are tolerated

Propagation Propagate by division between autumn and early spring or cut back plants after flowering in summer then divide, replant and water well

Suggested planting locations and garden types Flower borders and beds Ground Cover Underplanting of Roses and Shrubs Cottage & Informal Garden Gravel Garden Rock Garden

How to care

Pruning Remove flowered stems and old leaves to encourage the production of fresh leaves and flowers

Pests May be damaged by vine weevil larvae, Geranium sawfly larvae, capsid bug or slugs and snails

Diseases Downy mildew and a virus are occasional problems. Powdery mildew in dry conditions may be troublesome

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