Sidalcea 'William Smith'

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prairie mallow 'William Smith'

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prairie mallow 'William Smith' RHS 2002
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Herbaceous Perennial
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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

Position

Full sun

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
Aspect
South–facing
Exposure
Exposed or 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)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Malvaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
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
Name Status
Accepted

How to Grow

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

Propagation

Propagate by division in autumn or spring

Suggested planting locations and garden types

  • Cottage and informal garden
  • Prairie planting
  • Cut flowers
  • Flower borders and beds

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 susceptible to a rust