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Euphorbia horrida AGM

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© RHS 1965

Characteristics

Plant type

Cactus/Succulent or Conservatory/Greenhouse

Habit

Clump-forming

Toxicity

All parts are highly toxic by ingestion; sap may irritate skin and eyes

Resilience

Hardiness

H2 (tender - cool or frost-free greenhouse)

Colour

Flower

Green in Summer

Stem

Blue and Green in Autumn, Spring, Summer and Winter

Size

Ultimate height

1-1.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

10-20 years


Preferred common name

African milk barrel

Family

Euphorbiaceae


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

E. horrida is a cactus-like shrub with erect, ridged stems bearing long spines and solitary green flowers

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing, East-facing or North-facing
  • Sheltered

Cultivation

Grow under glass in a loam-based potting compost with sharp sand in full light with good ventilation. Water sparingly when in growth keep dry in winter. In the growing season feed a low nitrogen liquid fertiliser 2 or 3 times

Soil

  • Well-drained
  • Neutral, Alkaline or Acid
  • Loam or Sand

Propagation

Propagate by seed sown at 15 - 18ÂșC in early spring or stem in spring or early summer. Separate offsets in spring

Suggested planting locations and garden types

Low Maintenance or Patio/Container Plants


How to care

Pruning

No pruning required

Pests

May be attacked by mealybugs

Diseases

Generally disease free