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Hibiscus syriacus 'Oiseau Bleu' AGM

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© RHS 1997

Characteristics

Plant type

Shrub

Habit

Bushy

Toxicity

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

Blue and Purple in Autumn and Summer

Foliage

Dark Green in Autumn, Spring and Summer

Size

Ultimate height

1.5-2.5 metres

Ultimate spread

1.5-2.5 metres

Time to ultimate height

10-20 years


Preferred common name

rose mallow 'Oiseau Bleu'

Family

Malvaceae


Hibiscus can be deciduous or evergreen shrubs, trees, annuals or perennials, with simple or palmately lobed leaves and large, funnel-shaped flowers over a long flowering season

'Oiseau Bleu' is a medium-sized, upright deciduous shrub with lobed, dark green leaves. Flowers single, violet-blue with a maroon centre, to 8cm in width, in late summer and autumn

Other common names

  • rose mallow 'Blue Bird'

Synonym(s)

  • Hibiscus syriacus BLUE BIRD
  • Hibiscus syriacus 'Blue Bird'

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing or West-facing
  • Sheltered

Cultivation

Grow in a moist but well-drained soil in a sheltered position in full sun

Soil

  • Well-drained or Moist but well-drained
  • Alkaline or Neutral
  • Chalk, Clay, Sand or Loam

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

City/Courtyard Gardens or Wall-side Borders


How to care

Pruning

Pruning group 1

Pests

Generally pest free

Diseases

Powdery mildews may be a problem