• 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

Iris × robusta 'Gerald Darby'

Iris 'Gerald Darby'

Iris 'Gerald Darby'

© � RHS 2001

  • Other common names Iris 'Gerald Darby'

  • Synonyms Iris laevigata 'Gerald Darby'
    Iris versicolor 'Gerald Darby'

    Iris 'Gerald Darby'

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  • Genus Iris may be rhizomatous or bulbous perennials, with narrowly leaves and erect stems bearing flowers with 3 large spreading or pendent fall petals, alternating with 3 erect, often smaller, standard petals, in late winter, spring or early summer

  • Family Iridaceae / Iridaceae

  • Species 'Gerald Darby' is a rhizomatous perennial to 1.2m in height, with arching, narrow leaves and purplish stems bearing 3-4 violet-purple flowers, the falls whitish at the base with a yellow flash and dark veins


  • Foliage Deciduous

  • Habit Clump-forming

  • Toxicity Ingestion may cause severe discomfort



  • Full Sun

  • Partial Shade

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

  • Exposure Exposed or Sheltered


  • Chalk


  • Chalk


  • Chalk


  • MoisturePoorly-drained

  • SoilSand, Loam, Clay

  • pHAcid


  • Ultimate height

    1-1.5 metres

  • Ultimate spread

    0.1-0.5 metres

  • Time to ultimate height

    2-5 years

How to grow

Cultivation Grow in moist to wet, deep, humus-rich, acid soil; thrives at the margins of ponds or streams

Propagation Propagate by division of rhizomes from midsummer to early autumn

Suggested planting locations and garden types Flower borders and beds Cut Flowers Cottage & Informal Garden

How to care

Pruning Remove any dying foliage, old flower stems can be cut down after flowering

Pests Prone to slugs, snails and thrips. Birds often peck flowers

Diseases May be affected by grey moulds

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