Dodecatheon meadia f. album

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white-flowered American cowslip

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white-flowered American cowslip RHS
white-flowered American cowslip RHS
white-flowered American cowslip RHS

Synonyms

Dodecatheon meadia 'Albiflorum'
Primula meadia var. album

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Alpine Rockery Herbaceous Perennial
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A herbaceous perennial to 45cm in height, with a rosette of lance-shaped leaves and erect stems bearing large umbels of white, nodding flowers 2cm in length

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

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

Position

Full sun Partial shade
Aspect
South–facing or North–facing or West–facing or East–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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Primulaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Dodecatheon are summer-dormant herbaceous perennials with basal rosettes of simple leaves and erect or arching stems bearing umbels of cyclamen-like flowers with strongly reflexed petals
Name Status
Correct
Plant Range
E North America

How to Grow

Cultivation

Grow in a moist but well-drained, humus-rich soil in full sun or partial shade. Suitable for woodland or rock garden

Propagation

Propagate by seed in pots in an open frame as soon as seed is ripe; seed needs exposure to cold before it will germinate or propagate by division in spring

Suggested planting locations and garden types

  • Cottage and informal garden
  • Rock garden
  • Underplanting of roses and shrubs
  • Flower borders and beds

Pruning

No pruning required

Pests

May be susceptible to slugs and snails

Diseases

Generally disease-free