Psephellus dealbatus

RHS Plant Profile
mealy centaury

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mealy centaury RHS

Synonyms

Centaurea dealbata, Centaurea nogmovii

Plants for pollinators
Herbaceous Perennial
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A clump-forming perennial to 1m tall with narrowly oval, lobed leaves with whitish hairs underneath. In summer, lilac-pink flowers are carried on upright flower stems and comprise a ring of deeply-fringed outer petals surrounding a centre of paler inner petals

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
0.5-1 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Acid or 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
Asteraceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus
A genus of clump-forming, often woody herbaceous perennials with grey-green dissected leaves and showy pink, purple or white flowers
Name Status
Correct
Plant Range
Caucasus

How to Grow

Cultivation

Best grown in moist but well-drained, nutrient-poor soil in full sun. May need staking

Propagation

Propagate by seed or by division

Suggested planting locations and garden types

  • Coastal
  • Cottage and informal garden
  • Prairie planting
  • Wildflower meadow
  • Wildlife gardens
  • Cut flowers
  • Flower borders and beds

Pruning

deadhead regularly to prolong flowering, and cut back in autumn

Pests

Generally pest-free

Diseases

Powdery Milldew may be a problem