Agrostemma githago 'Ocean Pearl'

RHS Plant Profile
corncockle 'Ocean Pearl'

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A much-branched annual 60-90cm tall, with narrow, greyish-green leaves, and abundant, solitary white flowers, with fine dark speckling in the throat, in summer

Position

Full sun

Soil Types

Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1 year
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

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

Position

Full sun
Aspect
West–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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Caryophyllaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Potentially harmful
Human/Pets (dogs, poultry): Harmful if eaten. Wear gloves and other protective equipment when handling For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus
Agrostemma are upright annuals with narrow, opposite leaves and solitary, 5-petalled, open trumpet-shaped flowers with long calyx lobes showing between the petals
Name Status
Accepted

How to Grow

Cultivation

Grow in poor, well-drained soil in full sun. Lax growth needs to be staked, deadhead to prolong flowering. Flowers are suitable for cutting and are attractive to bees

Propagation

Propagate by seed sown in-situ, self-seeds prolifically

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Wildlife gardens
  • Flower borders and beds

Pruning

Cut back after flowering

Pests

Generally pest-free

Diseases

Generally disease-free