Nigella orientalis 'Transformer'

RHS Plant Profile
yellow fennel flower 'Transformer'

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yellow fennel flower 'Transformer' RHS
Annual Biennial
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A feathery-leaved annual with yellow, saucer-shaped flowers in late spring and early summer. The pale green seedpods mature to ivory, and are strongly ribbed, resembling an inside-out umbrella

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

Chalk Loam Sand
Moisture
Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
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)
H3

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Ranunculaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus
Nigella are upright, bushy annuals with finely dissected leaves and solitary flowers with 5 blue or white, petal-like sepals and feathery bracts, followed by ornamental seed pods
Name Status
Accepted

How to Grow

Cultivation

Grow in any well-drained soil in full sun

Propagation

Propagate by seed sown in situ in mid-spring or autumn. Autumn-sown plants may need the winter protection of a cold frame or cloche

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Patio and container plants
  • Flower borders and beds
  • Cut flowers

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free