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Herbaceous Perennial

Iris ensata var. spontanea

I. ensata var. spontanea is a robust, clump-forming perennial growing to 1.2m tall witherect, narrow leaves and in summer, bright purple flowers with yellow marks on the falls

Synonyms
Iris kaempferi var. spontanea
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Size
Ultimate height
1–1.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Clay
Loam
Sand
Moisture
Poorly–drained
pH
Acid
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Purple Green
Autumn
Winter
Position
  • Full shade
  • Partial shade
Aspect

South–facing or East–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H6
Botanical details
Family
Iridaceae
Native to the UK
No
Foliage
Deciduous
Habit
Clump forming
Potentially harmful
Ingestion may cause severe discomfort. Wear gloves and wash hands after handling
Genus

Iris may be rhizomatous or bulbous perennials, with narrow 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

Name status

Correct

Plant range
Japan

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How to grow

Cultivation

Grow in moist to wet, deep, humus-rich, acid soil; it 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
  • Cottage and informal garden
  • City and courtyard gardens
  • Coastal
  • Wall side borders
  • Flower borders and beds
Pruning

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

Pests

May be attacked by slugs and snails

Diseases

Generally disease free

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