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Fritillaria imperialis AGM

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© RHS 2003

Characteristics

Plant type

Bulb

Habit

Columnar/Upright

Resilience

Hardiness

H6 (hardy - very cold winter)

Colour

Flower

Orange or Yellow in 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

crown imperial

Family

Liliaceae


Fritillaria are bulbous herbaceous perennials with lance-shaped or linear leaves and nodding bell-shaped or bowl-shaped flowers that may be solitary or in racemes or umbels

F. imperialis is a robust perennial with stout, erect stems bearing whorled, lance-shaped leaves and, in early summer, a terminal umbel of bell-shaped orange or yellow flowers beneath a crown of bracts

Other common names

  • crown on crown
  • royal crown flower

Synonym(s)

  • Fritillaria imperialis 'Kaiser'

How to grow

Sunlight

  • Full sun

Aspect

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

Cultivation

Grows well in most fertile, well-drained soils. Handle the fragile bulbs carefully and plant at four times own depth

Soil

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

Propagation

Propagate by seed, sown in pots in a cold frame in autumn. Needs exposure to winter cold for germination in spring. division offsets in late summer

Suggested planting locations and garden types

Cottage/Informal Garden or Flower borders and beds


How to care

Pruning

No pruning required

Pests

Prone to slugs and lily beetle

Diseases

Generally disease free