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Herbaceous Perennial

Astrantia major 'Star of Billion'PBR
  • RHS Plants for pollinators

masterwort 'Star of Billion'

'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

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Size
Ultimate height
0.5–1 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Clay
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer White Green Pink Green
Autumn Green
Winter
Position
  • Full sun
  • Partial shade
Aspect

East–facing or South–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H7
Botanical details
Family
Apiaceae
Native to the UK
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 affected by slugs, snails, aphids and astrantia leaf miner

Diseases

May be affected by powdery mildews

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