• 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

Iris japonica

fringed iris

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
fringed iris

© RHS 1999

  • Other common names fringed iris

  • Family Iridaceae

  • 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

  • Details I. japonica is a rhizomatous perennial forming fans of glossy evergreen foliage. Branched stems to 45cm bear white or pale blue flowers 4-5cm in width, the fringed falls spotted with deep purple, with orange crests

  • Plant range China, Japan

Characteristics

  • Foliage Evergreen

  • Habit Tufted

  • Toxicity Ingestion may cause severe discomfort

  • 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)

    H4

Colour

Sunlight

  • Full Sun

  • Partial Shade

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

  • Exposure Sheltered

Soil

  • Chalk

    Loam

  • Chalk

    Clay

  • MoistureMoist but well-drained, Poorly-drained

  • SoilLoam, Clay

  • pHAcid, Alkaline, Neutral

Size

  • 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 moist, humus-rich soil in a sheltered position in sun or partial shade

Propagation Propagate by seed sown in pots in a cold frame in autumn or spring. Propagate by division of rhizomes from midsummer to early autumn

Suggested planting locations and garden types Flower borders and beds Cut Flowers Patio & Container Plants Rock Garden

How to care

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

Pests Prone to slugs, snails and thrips

Diseases May be affected by grey moulds

Advertise here

Did you find the information you were looking for?

RHS members can get exclusive individual advice from the RHS Gardening Advice team.

Join the RHS now