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Herbaceous Perennial

Iris douglasiana

Douglas iris

An evergreen perennial to 70cm tall, with narrow, dark green leaves and usually branched stems bearing purple or lavender-blue flowers up to 10cm wide in late spring, the falls often with a white basal patch

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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
Sand
Moisture
Moist but well–drained, Well–drained
pH
Acid, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Blue Purple Green
Summer Green
Autumn Green
Winter Green
Position
  • Full sun
  • Partial shade
Aspect

South–facing or North–facing or West–facing or East–facing

Exposure
Sheltered
Hardiness
H6
Botanical details
Family
Iridaceae
Native to the UK
No
Foliage
Evergreen
Habit
Bushy
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

Correct

Plant range
North W America

How to grow

Cultivation

The most easily grown of the Pacific Coast Iris tolerating slightly drier and more alkaline soils

Propagation

Propagate by seed or division in spring

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

Remove dead foliage, 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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