• 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

Euphorbia cornigera

horned spurge

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
horned spurge

© RHS 2003

  • Other common names horned spurge

  • Synonyms Euphorbia longifolia misapplied
    Euphorbia wallichii Kohli

  • Family Euphorbiaceae

  • Genus Euphorbia can be annuals, perennials, shrubs or succulents, with milky sap and small flowers held within cupped, often colourful bracts

  • Details E. cornigera is a spreading perennial to 75cm in height, with reddish stems bearing narrowly oblong, dark green leaves with paler midrib, and clusters of bright yellow flowerheads in summer

  • Plant range N Pakistan to Himalaya

Characteristics

  • Foliage Deciduous

  • Habit Clump-forming

  • Toxicity All parts are highly toxic by ingestion

  • 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

  • Partial Shade

  • Aspect South-facing or East-facing or West-facing

  • Exposure Exposed or Sheltered

Soil

  • Chalk

    Chalk

  • Loam

    Loam

  • Sand

    Sand

  • MoistureMoist but well-drained

  • SoilChalk, Loam, Sand

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in any normal garden soil that is moist but well-drained either in sun or in partial shade

Propagation Propagate by seed sown in pots in a cold frame either when ripe or in spring. Propagate by division in early spring

Suggested planting locations and garden types Flower borders and beds Low Maintenance City & Courtyard Gardens Coastal Cottage & Informal Garden

How to care

Pruning Cut back flowering shoots to ground level in late summer or autumn

Pests Aphids may be a problem

Diseases May be subject to grey moulds

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