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Iris laevigata

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Characteristics

Plant type

Aquatic, Bog or Herbaceous Perennial

Habit

Clump-forming

Toxicity

Ingestion may cause severe discomfort

Resilience

Hardiness

old H4 (hardy)

Colour

Flower

Purple in Summer

Foliage

Green in Autumn, Spring and Summer

Size

Ultimate height

0.5-1 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

smooth 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. laevigata is a rhizomatous perennial to 70cm in height, with erect, sword-shaped leaves and rich purple flowers 8-10cm in width, each fall with a narrow white flash at the base

Other common names

  • Japanese iris

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing or West-facing
  • Sheltered or Exposed

Cultivation

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

Soil

  • Poorly-drained
  • Acid or Neutral
  • Clay or Loam

Propagation

Propagate by division from mid-summer to early autumn

Suggested planting locations and garden types

City/Courtyard Gardens, Cottage/Informal Garden or Flower borders and beds


How to care

Pruning

No pruning required

Pests

Sawflies may cause problems. Can be attacked by snails and slugs

Diseases

Generally disease free