• 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 milii var. splendens

Christ's thorn

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
Christ's thorn

© RHS

  • Other common names Christ's thorn

  • Synonyms Euphorbia splendens

  • 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. milii var. splendens is a semi-prostrate to scrambling, slow growing, mainly evergreen, semi-succulent shrub. The stems are armed with well-spaced thorns and the small yellow flowers with their showy red bracts appear mostly in spring and summer

  • Plant range Madagascar

Characteristics

  • Foliage Evergreen

  • Habit Bushy

  • Toxicity All parts are poisonous 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)

    H1B

Colour

Sunlight

  • Full Sun

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

  • Exposure Sheltered

Soil

  • Sand

    Sand

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained

  • SoilSand, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 1-1.5 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow under glass in a mix of three parts loam based potting compost to one part grit in full light. Water sparingly when in growth applying a low nitrogen liquid fertiliser monthly. Keep drier in winter

Propagation Propagate by seed sown as soon as ripe at 15 to 20 °C

Suggested planting locations and garden types Low Maintenance Sub-tropical Patio & Container Plants

How to care

Pruning Prune lightly after flowering

Pests mealybugs may be a problem under glass or indoors

Diseases May be subject to grey moulds

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