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Hibiscus syriacus 'William R. Smith' AGM

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© RHS 1998

Characteristics

Plant type

Shrub

Habit

Bushy

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

White in Autumn and Summer

Foliage

Dark Green in Autumn, Spring and Summer

Size

Ultimate height

1.5-2.5 metres

Ultimate spread

1-1.5 metres

Time to ultimate height

10-20 years


Preferred common name

rose mallow 'William R. Smith'

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

'William R. Smith' is a robust deciduous shrub with dark green, three-lobed leaves and single white flowers to 10cm across in late summer and autumn

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing or East-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
  • Sand, Clay, Chalk or Loam

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

City/Courtyard Gardens, Coastal, Cottage/Informal Garden, Flower borders and beds, Hedging/Screens, Patio/Container Plants or Wall-side Borders


How to care

Pruning

Pruning group 1

Pests

Aphids, mealybugs and thrips may be a problem

Diseases

Powdery mildews may be a problem