Astrantia major 'Star of Billion'PBR

RHS Plant Profile
masterwort 'Star of Billion'

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masterwort 'Star of Billion' RHS / Joanna Kossak
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Herbaceous Perennial
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'Star of Billion' is a clump-forming perennial to 75cm tall with deeply-cut, mid-green leaves. In summer, branching stems bear flowerheads of tiny greenish-white to white flowers surrounded by white, strap-shaped bracts tipped with green

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

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

Position

Full sun Partial shade
Aspect
East–facing or 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
Apiaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Astrantia are clump-forming herbaceous perennials with palmately lobed basal leaves and branched, erect, wiry stems bearing compact umbels of tiny flowers surrounded by a rosette of showy bracts
Name Status
Accepted

How to Grow

Cultivation

Grow in moisture-retentive but well-drained, preferably humus-rich, fertile soil in sun or partial shade

Propagation

Propagate by division in spring

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Wildlife gardens
  • Low Maintenance
  • Flower borders and beds
  • Ground cover
  • Cut flowers

Pruning

No pruning required, but deadhead to encourage repeat flowering and, if seedlings are not wanted, deadhead before seed is ripe

Pests

May be susceptible to slugs, snails, aphids and astrantia leaf miner

Diseases

May be susceptible to powdery mildews