Diplarrena latifolia

RHS Plant Profile
western flag iris

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western flag iris Dorling Kindersley Ltd
western flag iris Dorling Kindersley Ltd
western flag iris RHS

Synonyms

Diplarrena moraea West Coast form

Herbaceous Perennial

A clump-forming, rhizomatous, evergreen perennial to about 65cm. It has stiff, flat, narrowleaves and lightly scented flowers with three large and three small, white petals the smaller ones with yellow and purple markings

Position

Full sun, Partial shade

Soil Types

Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

Loam Sand
Moisture
Moist but well–drained
pH
Acid or Neutral

Position

Full sun Partial shade
Aspect
South–facing or West–facing
Exposure
Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H3

Colour & Scent

Fragrance Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Iridaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Columnar upright
Potentially harmful
Causes severe discomfort if ingested. Wear gloves and wash hands after handling
Genus
Diplarrena are rhizomatous, evergreen perennials related to irises. They are clump-forming, producing tufts of stiff linear to sword-shaped leaves to 30cm, the flowers borne above the leaves on wiry stems. Flowers 2-3 in a terminal cluster, with 3 large, white outer segments, the inner 3 more erect and usually coloured
Name Status
Correct
Plant Range
Tasmania

How to Grow

Cultivation

Grow in a sunny position in humus-rich, moist, neutral to acid soil. Partial shade is suitable when planted in a hot site

Propagation

Propagate by seed sown in containers in a cold frame in autumn or spring. Can also be propagated by division in spring

Suggested planting locations and garden types

  • Coastal
  • Gravel garden
  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Mediterranean climate plants
  • Flower borders and beds

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free