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Iris pseudacorus 'Roy Davidson' AGM

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Characteristics

Plant type

Bog or Herbaceous Perennial

Habit

Clump-forming

Toxicity

Ingestion may cause severe discomfort

Resilience

Hardiness

H7 (very hardy)

Colour

Flower

Brown and Yellow in Summer

Foliage

Green in 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

yellow flag 'Roy Davidson'

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

'Roy Davidson' is a clump-forming perennial to 1.1m, the stems with 10 flowers or more, light yellow with light brown veining, the falls with a crescent-shaped brown central flash

Synonym(s)

  • Iris 'Roy Davidson'

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

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

Cultivation

Grow in moist to wet, deep, humus-rich, acid soil; it thrives at the margins of large ponds or streams; vigorous so site with care

Soil

  • Moist but well-drained or Poorly-drained
  • Acid
  • Clay or Loam

Propagation

Propagate by division of rhizomes from midsummer to early autumn

Suggested planting locations and garden types

City/Courtyard Gardens, Coastal, Cottage/Informal Garden, Flower borders and beds or Wall-side Borders


How to care

Pruning

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

Pests

May be attacked by slugs, snails and thrips

Diseases

Generally disease free