Glaucium flavum

RHS Plant Profile

yellow horned poppy

RHS

Other common names

bruisewort, caillichín na trá, horned poppy, sea poppy, seaside poppy, pabi corniog melyn

Synonyms

Glaucium flavum f. flavum
Glaucium luteum

Herbaceous Perennial Annual Biennial

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A short-lived perennial, usually grown as a biennial, forming a rosette of deeply-lobed, blue-green leaves. Branched, grey stems carry bright yellow or orange poppy flowers in summer, followed by long, narrow, upright seed pods

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: 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): H4
Drought Resistance: Yes

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Papaveraceae
Native to GB/Ireland: Yes
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: Europe Africa Asia

How to Grow

Cultivation

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

Propagation

Sow seed in situ in spring or autumn

Suggested planting locations and garden types

Coastal
Cottage and informal garden
Gravel garden
Wildlife gardens
Wildflower meadow
Flower borders and beds

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free