Euphorbia milii var. milii

RHS Plant Profile

crown of thorns

John Fielding

Synonyms

Euphorbia milii var. tananarivae
Euphorbia milii var. vulcani

Shrubs Conservatory Greenhouse Houseplants

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An evergreen shrub with spiny stems, succulent-like green branches, leathery ovate green leaves and clusters of bright pink flowers with yellow centres which appear in the summer

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity: 10–20 years
Max Spread: 0.5-1 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: East–facing or South–facing
Exposure: 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): H1B
Drought Resistance: Yes

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Euphorbiaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Bushy
Potentially harmful: Humans/Pets: IRRITANT to skin/eyeharmful if eaten. Wear gloves and other protective equipment when handling. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus: Euphorbia can be annuals, perennials, shrubs or succulents, with milky sap and small flowers held within cupped, often colourful bracts
Name Status: Correct
Plant Range: Madagascar

How to Grow

Cultivation

Grow under glass in a mix of three parts peat-free, loam-based potting compost to one part grit in full light. Water sparingly when in growth applying a low nitrogen liquid fertiliser monthly. Keep dry in winter. See Euphorbia for further advice

Propagation

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

Suggested planting locations and garden types

Sub-tropical
Patio and container plants
Houseplants
Low Maintenance
Conservatory and greenhouse

Pruning

Pruning group 6

Pests

Generally pest-free

Diseases

May be susceptible to grey moulds