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Iris japonica AGM

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© RHS 1999

Characteristics

Plant type

Herbaceous Perennial

Habit

Tufted

Toxicity

Ingestion may cause severe discomfort

Resilience

Hardiness

H4 (hardy - average winter)

Colour

Flower

Orange, Purple and White in Spring

Foliage

Green in Autumn, Spring, Summer and Winter

Size

Ultimate height

0.1-0.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

fringed iris

Family

Iridaceae


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

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

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, East-facing or West-facing
  • Sheltered

Cultivation

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

Soil

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

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

Patio/Container Plants, Rock Garden, Flower borders and beds or Cut Flowers


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