Astrantia minor

RHS Plant Profile
small black masterwort

Save a plant

Where do you want to save Astrantia minor?

Plants I own
Wishlist
Go to My Plants
small black masterwort RHS
Herbaceous Perennial

A clump-forming perennial to around 30cm tall with palmate basal leaves divided into seven to nine lanceolate, coarsely-toothed leaflets. Small white to pale pink flowerheads up to around 2cm across are borne singly or in twos or threes on slender stems in summer

Position

Full sun, Partial shade

Soil Types

Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Loam Sand
Moisture
Well–drained
pH
Acid or Neutral

Position

Full sun Partial shade
Aspect
West–facing or East–facing or South–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
Unresolved

How to Grow

Cultivation

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

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 and informal garden
  • Gravel garden
  • Wildlife gardens
  • Flower borders and beds

Pruning

Deadhead before seed is ripe to prevent self-seeding

Pests

May be susceptible to astrantia leaf miner

Diseases

May be susceptible to powdery mildews