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Sidalcea 'William Smith' AGM

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© RHS 2002

Characteristics

Plant type

Herbaceous Perennial

Habit

Clump-forming

Resilience

Hardiness

H7 (very hardy)

Colour

Flower

Dark Pink 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

prairie mallow 'William Smith'

Family

Malvaceae


Sidalcea can be annuals or perennials, forming a clump of rounded or palmately lobed basal leaves, with erect stems bearing more deeply divided leaves and terminal racemes of 5-petalled mallow-like flowers

'William Smith' is an erect herbaceous perennial making a clump to 90cm in height, with rounded basal leaves and deeply lobed stem leaves. Flowers 5cm in width, with five salmon tinted, deep rose-pink petals

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing
  • Exposed or Sheltered

Cultivation

Best grown in moderately fertile, humus-rich, moist but well-drained, light, sandy, neutral to slightly acid soil in full sun; will tolerate other soils but resents waterlogging. Provide a dry mulch of bracken or straw during cold winters

Soil

  • Moist but well-drained
  • Acid or Neutral
  • Sand or Loam

Propagation

Propagate by division in autumn or spring

Suggested planting locations and garden types

Cottage/Informal Garden, Flower borders and beds, Cut Flowers or Prairie Planting


How to care

Pruning

Cut stems back hard after flowering to encourage further flowers and to prevent self-seeding

Pests

Slugs may be a problem

Diseases

May be subject to a rust