• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Agrostemma githago

corncockle

  • Other common names corncockle
    corn cockle

    bastard nigella
    corn pink
    gith
    joy of love
    little and pretty

    see more
  • Synonyms Agrostemma nicaeense

  • Family Caryophyllaceae

  • 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

  • Details A. githago is an upright annual to 75cm, with narrow grey-green leaves and open funnel-shaped magenta-purple flowers 5cm across in summer

Characteristics

  • Foliage Deciduous

  • Habit Columnar/Upright

  • Toxicity All parts, but particularly the seeds may cause severe discomfort if ingested

  • 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

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Sand

    Sand

  • Loam

    Loam

  • MoistureWell-drained

  • SoilSand, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 1-2 years

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 Cut Flowers Flower borders and beds Wildlife Gardens Cottage & Informal Garden Wildflower meadow

How to care

Pruning Cut back after flowering

Pests Generally pest free

Diseases Generally disease free

Did you find the information you were looking for?

RHS members can get exclusive individual advice from the RHS Gardening Advice team.

Join the RHS now

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.