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Astrantia maxima AGM

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© RHS 2001

Characteristics

Plant type

Herbaceous Perennial

Habit

Clump-forming

Resilience

Hardiness

H6 (hardy - very cold winter)

Colour

Flower

Pink in Summer

Foliage

Green in Spring and Summer

Size

Ultimate height

0.1-0.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

largest masterwort

Family

Apiaceae


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

A. maxima is an herbaceous perennial to 60cm, forming a clump of plentiful, three-lobed leaves with branching stems bearing flower-heads 3-6cm in width, with broad, pinkish bracts surrounding tiny pink flowers

Synonym(s)

  • Astrantia helleborifolia

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, East-facing, West-facing or North-facing
  • Sheltered

Cultivation

Best grown in moist, fertile, humus-rich soil in sun or partial shade but will tolerate drier conditions

Soil

  • Moist but well-drained or Poorly-drained
  • Acid, Alkaline or Neutral
  • Loam, Chalk, Sand or Clay

Propagation

Propagate by seed sown in pots in a cold frame as soon as seed is ripe or propagate by division in spring

Suggested planting locations and garden types

Cottage/Informal Garden, Flower borders and beds, Cut Flowers or Coastal


How to care

Pruning

Deadhead before seed is ripe to prevent self-seeding

Pests

Generally pest free

Diseases

Powdery mildews may be troublesome