Silene hookeri subsp. bolanderi

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<em>Silene</em> <em>hookeri</em> subsp. <em>bolanderi</em> RHS
Alpine Rockery

A low-growing, mat-forming, deciduous alpine perennial with hairy green-grey leaves and deeply-cut snow white flowers appearing in the summer

Position

Full sun

Soil Types

Loam, Sand

Max Height

Up to 10 cm

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
Up to 10 cm

Growing Conditions

Loam Sand
Moisture
Well–drained
pH
Acid

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)
H6

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Caryophyllaceae
Native to GB/Ireland
No
Foliage
Deciduous
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
Correct
Plant Range
W North America

How to Grow

Cultivation

Grow in moderately fertile, very well-drained, acid soil in full sun. Suitable for rock garden, scree bed or alpine house. Resents winter wet

Propagation

Propagate by seed or by softwood cuttings in spring

Suggested planting locations and garden types

  • Gravel garden
  • Patio and container plants
  • Rock garden
  • Conservatory and greenhouse

Pruning

No pruning required

Pests

May be susceptible to aphids, glasshouse red spider mite and glasshouse whitefly under glass

Diseases

Generally disease-free