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Ammi majus

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© RHS

Characteristics

Plant type

Annual/Biennial

Habit

Columnar/Upright

Resilience

Hardiness

old H4 (hardy)

Colour

Flower

White in Summer

Foliage

Green in Spring and Summer

Size

Ultimate height

0.5-1 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

1-2 years


Preferred common name

false bishop's weed

Family

Apiaceae


Ammi can be annuals or biennials, upright or spreading, with fern-like, pinnately divided leaves and large, branched umbels of small creamy-white flowers in summer

Ammi majus is an upright annual with 2 to 3-pinnate leaves and compound umbels of small white flowers in summer

Other common names

  • bullwort
  • common bishop's weed
  • herb William

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

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

Cultivation

Grow in any well-drained soil in full sun or partial shade, provide support when seedlings reach 7-10cm (3-4in) high

Soil

  • Well-drained
  • Neutral, Acid or Alkaline
  • Loam, Sand or Chalk

Propagation

Propagate by seed sown in situ in spring

Suggested planting locations and garden types

Cottage/Informal Garden, Flower borders and beds or Wildflower meadow


How to care

Pruning

Cut back after flowering

Pests

Generally pest free

Diseases

Generally disease free