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Herbaceous Perennial

Iris × robusta 'Dark Aura'
  • RHS AGM

iris 'Dark Aura'

'Dark Aura' is a rhizomatous perennial to 95cm in height, with narrow leaves, dark red in spring, becoming green with a purple tinge at the base, and straight, dark purple stems to 70cm bearing 6-8 small flowers. Standards are cupped, erect, violet. Falls are drooping, violet, with a yellow, white-edged signal

Synonyms
Iris 'Dark Aura'
Iris versicolor 'Dark Aura'
see moreIris virginica 'De Luxe'
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Size
Ultimate height
0.5–1 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Clay
Loam
Moisture
Moist but well–drained, Poorly–drained
pH
Acid, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Black Purple Red Green
Summer Black Purple Blue Purple Green
Autumn
Winter
Position
  • Full sun
  • Partial shade
Aspect

East–facing or South–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H7
Botanical details
Family
Iridaceae
Native to the UK
No
Foliage
Deciduous
Habit
Clump forming
Potentially harmful
Harmful if eaten. Wear gloves and other protective equipment when 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

Accepted

How to grow

Cultivation

Grow in moist to wet, deep, humus-rich neutral to acid soil in sun or part shade, it thrives in the margins of ponds and ideal for a bog garden

Propagation

Propagate by division of rhizomes from midsummer to early autumn

Suggested planting locations and garden types
  • City and courtyard gardens
  • Cottage and informal garden
  • Coastal
  • Flower borders and beds
  • Wall side borders
Pruning

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

Pests

May be susceptible to slugs, snails and thrips

Diseases

May be susceptible to aphid-borne viruses, bacterial soft rot and grey moulds; see Iris diseases

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