Euphorbia milii (Crown of thorns)

Botanical name

Euphorbia milii

Other names

Crown of thorns, Christ plant, Christ thorn, Euphorbia bojeri, Euphorbia milii var. milii , Euphorbia splendens, Euphorbia splendens var. bojeri

Genus

Euphorbia Euphorbia

Species

E. milii - E. milii is a tender, bushy, slow-growing, evergreen shrub with succulent, thorny stems bearing oblong to ovate, pointed, leathery, bright green leaves and clusters of tiny yellow flowers surrounded by prominent, bright red bracts.

Foliage

Evergreen

Habit

Branching, Bushy, Upright

Toxicity

Sap is a skin irritant. All parts are poisonous if ingested.

Awards

RHS AGM (Award of Garden Merit)

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Colour

Flower

Yellow, Red in Summer

Foliage

Bright-green in All seasons

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How to care

Watch out for

Specific pests

Mealybugs

Specific diseases

Grey mould

General care

Pruning

Pruning group 6

Propagation

Sow seed as soon as ripe at 15-20C.

Propagation methods

Seed, Softwood cuttings, Stem tip cuttings

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Monthly care advice

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Where to grow

Euphorbia milii (Crown of thorns) will reach a height of 1m and a spread of 0.5m after 5-10 years.

Suggested uses

Conservatory, Containers, Drought Tolerant, Greenhouse, Indoor, Low Maintenance, Sub-Tropical

Cultivation

Under glass, grow in 3 parts loam-based compost, 1 part grit in full light. Ventilate well. In growth, water sparingly and give a low-nitrogen liquid feed monthly; keep dry in winter. Outdoors in frost-free areas, grow in well-drained soil in full sun.

Soil type

Chalky, Loamy, Sandy

Soil drainage

Well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Full Sun

Aspect

South, East

Exposure

Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Indoor heated (H1), Tender in frost (H3)

USDA zones

Zone 12, Zone 11, Zone 10

Defra's Risk register #1

Plant name

Euphorbia milii (Crown of thorns)

Common pest name

grape ground pearl

Scientific pest name

Margarodes vitis

Type

Insect

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

2

Impact (1 is very low - 5 is very high)

5

General biosecurity comments

Main pathway; Vitis spp. plants for planting; already prohibited. However; further consideration of other pathways is required.

Defra's Risk register #2

Plant name

Euphorbia milii (Crown of thorns)

Common pest name

Powdery mildew: cotton; Powdery mildew: eggplant; Powdery mildew: pepper; Powdery mildew: tomato

Scientific pest name

Leveillula taurica

Type

Fungus

Current status in UK

Present (Limited)

Likelihood to spread in UK (1 is very low - 5 is very high)

3

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

Believed to be present and no statutory action is being taken. Status needs to be confirmed by survey.

Defra's Risk register #3

Plant name

Euphorbia milii (Crown of thorns)

Common pest name

cotton mealybug

Scientific pest name

Phenacoccus solenopsis

Type

Insect

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

3

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

Watching brief for potential impact on tomato production in the Mediterranean. Other southern European countries likely to be more at risk. Precautionary action will be taken on findings on planting material to protect glasshouse crops and botanical gardens.

About this section

Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.

Traveling or importing plants? Please read "Don't risk it" advice here

Suspected outbreak? Click here for contact details to report to the relevant authority.

Date updated: 7^th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/