Glaucium corniculatum

RHS Plant Profile
red horned poppy

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Synonyms

Glaucium flavum red-flowered
Glaucium phoenicium

Annual Biennial
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A slightly hairy biennial forming a rosette of deeply-lobed, silver-grey leaves. Branched grey stems carry crimson-red to orange poppy flowers usually with a black spot at the base of each petal, from summer to early autumn followed by long narrow seed pods

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 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
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)
H6
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Papaveraceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Glaucium are erect, often rosette-forming, annuals, biennials and short-lived perennials with matt, blue-green or grey-green leaves and showy, poppy flowers
Name Status
Correct
Plant Range
S Europe

How to Grow

Cultivation

Grow in poor to moderately fertile well-drained soil in full sun. Resents root disturbance

Propagation

Propagate by seed in situ in spring or autumn

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Gravel garden
  • Wildlife gardens
  • Flower borders and beds
  • Garden edging
  • Underplanting of roses and shrubs

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free