Centranthus ruber 'Snowcloud'

RHS Plant Profile
red valerian 'Snowcloud'

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Herbaceous Perennial Annual Biennial
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A short-lived perennial sometimes grown as an annual, with a woody base, grey-green leaves and dense clusters of tiny, fragrant white flowers from from early summer to early autumn

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

Chalk Loam Sand
Moisture
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)
H5
Drought Resistance
Yes

Colour & Scent

Fragrance Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Caprifoliaceae
Native to GB/Ireland
No
Foliage
Semi evergreen
Habit
Clump forming, Columnar upright
Genus
Centranthus may be annuals or perennials, with usually simple, opposite leaves and terminal clusters of small, trumpet-shaped flowers
Name Status
Accepted

How to Grow

Cultivation

Prefers poor to moderately fertile, well drained, chalky or lime soil in full sun. Thrives in stony soil and will not tolerate winter wet. May need support if grown in richer soils, see staking perennials

Propagation

Propagate by seed, sown in early spring for flowers in the first year, or by division in early spring

Suggested planting locations and garden types

  • Cottage and informal garden
  • Gravel garden
  • Mediterranean climate plants
  • Wildlife gardens
  • Flower borders and beds

Pruning

Deadhead regularly

Pests

Generally pest-free

Diseases

Generally disease-free