Silene uniflora 'Robin Whitebreast' (d)

RHS Plant Profile
sea campion 'Robin Whitebreast'

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Other common names

double sea campion, witches' thimbles

Synonyms

Silene maritima 'Flore Pleno', Silene maritima 'Robin White Breast', Silene uniflora 'Alba Plena', Silene uniflora 'Flore Pleno', Silene uniflora 'Weisskehlchen', Silene uniflora [Weisskehlchen], Silene vulgaris subsp. maritima 'Flore Pleno'

Alpine Rockery Herbaceous Perennial
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A semi-evergreen perennial to 20cm tall forming a mat of grey-green, lance-shaped, fleshy leaves to 2cm long. Pompom-like, double white flowers are borne above the foliage on branched stems in summer

Position

Full sun

Soil Types

Chalk, 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

Chalk Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–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
Caryophyllaceae
Native to GB/Ireland
No
Foliage
Semi evergreen
Habit
Matforming
Genus
Silene can be annuals, biennials or herbaceous or evergreen perennials, with opposite, untoothed leaves and solitary or clustered flowers with 5, usually notched petals
Name Status
Accepted

How to Grow

Cultivation

Grow in a well-drained soil in a sunny position. Ideal for rock gardens, scree beds, gravel gardens, walls and alpine troughs

Propagation

Divide congested mats in spring

Suggested planting locations and garden types

  • Cottage and informal garden
  • Gravel garden
  • Rock garden
  • Coastal
  • Wildlife gardens
  • Flower borders and beds
  • Garden edging
  • Banks and slopes

Pruning

deadhead after flowering

Pests

Generally pest-free

Diseases

Generally disease-free