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Selinum wallichianum

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© RHS 1969

Characteristics

Plant type

Herbaceous Perennial

Habit

Clump-forming

Resilience

Hardiness

H7 (very hardy)

Colour

Flower

White in Autumn and Summer

Foliage

Green in Autumn, Spring and Summer

Size

Ultimate height

1-1.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

Wallich milk parsley

Family

Apiaceae


Selinum are tap-rooted herbaceous perennials with finely dissected leaves and large, flattened umbels of tiny flowers

S. wallichianum is a clump-forming perennial with large, triangular, 2 to 3-pinnate leaves and large umbels of white flowers in summer and autumn

Synonym(s)

  • Selinum tenuifolium
  • Selinum wallichianum subsp. tenifolium

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

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

Cultivation

Grow in moderately fertile, moist but well-drained soil in full sun or partial shade

Soil

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

Propagation

Propagate by seed in pots in a cold frame as soon as seed is ripe; prick out into deep containers to avoid tap root damage. Propagate by division in early spring but take care as it resents disturbance

Suggested planting locations and garden types

Cottage/Informal Garden, Flower borders and beds, Architectural or Wildlife Gardens


How to care

Pruning

Remove faded flowerheads and cut back dying foliage in autumn

Pests

Slugs and snails may be a problem

Diseases

May be subject to powdery mildews in dry conditions