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Herbaceous Perennial

Iris missouriensis

Missouri flag

A spreading rhizomatous perennial to 50cm, with long narrow, arching leaves and flowers 6-7cm in width, the standards pale lavender, the falls paler but strongly veined violet-blue

Synonyms
Iris montana
Iris tolmieana
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Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Loam
Moisture
Well–drained
pH
Acid, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Blue Purple Green
Autumn
Winter
Position
  • Full sun
  • Partial shade
Aspect

West–facing or East–facing or South–facing

Exposure
Exposed or Sheltered
Hardiness
H5
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. Pets: Harmful if eaten. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
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
N America, Mexico

How to grow

Cultivation

Grow in well-drained, fertile, neutral to slightly acid loam in full sun or partial shade

Propagation

Propagate by division of rhizomes from midsummer to early autumn

Suggested planting locations and garden types
  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • 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

Get involved

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