How to Grow Crown of Thorns
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Crown of Thorns
Euphorbia milii
shrubCrown of Thorns is a succulent shrub native to Madagascar, featuring thorny stems adorned with vibrant flower-like bracts in red, pink, yellow, or white. The plant produces small true flowers surrounded by showy, colorful modified leaves (bracts) that can bloom year-round in ideal conditions. It's an excellent houseplant and outdoor ornamental in warm climates, valued for its drought tolerance and long flowering period.
When should you plant Crown of Thorns in your zone?
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Example Crown of Thorns timeline · Pittsburgh, PA (Zone 6b)
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Plant Crown of Thorns
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Crown of Thorns
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Crown of Thorns dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 10-11; grown indoors elsewhere
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Seedling
4-8 weeksTiny plantlets with first true leaves emerging; very delicate and slow-growing
Keep soil barely moist, provide bright indirect light, maintain 70-80°F temperature, protect from direct sun initially
Vegetative
3-6 monthsYoung plant developing thorny stems and glossy green leaves; no flowers yet
Water sparingly, gradually increase light exposure, fertilize monthly with diluted succulent fertilizer, ensure excellent drainage
Pre-flowering
2-3 monthsPlant matures, stems thicken, leaf production continues, flower buds begin forming at stem tips
Maintain full sun exposure, reduce watering slightly, apply phosphorus-rich fertilizer monthly, prune leggy growth if desired
Flowering
Several months to year-round in optimal conditionsColorful bracts appear in clusters at branch tips; true flowers emerge from center of bracts in yellow or other colors
Continue full sun, water only when dry, fertilize every 2-3 weeks with bloom-promoting formula, remove faded bracts to encourage new flowers
Dormancy/Rest
2-3 months (seasonal)Plant growth slows in winter months; flowering decreases; stems may appear less vigorous
Reduce watering significantly, lower temperature if possible (55-60°F ideal), reduce or stop fertilizing, maintain bright light, prune to shape if needed
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with isopropyl alcohol solution or insecticidal soap; isolate plant; check regularly for reinfestation
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Increase humidity, spray with water to dislodge, use neem oil or miticide if severe; ensure good air circulation
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Remove manually with cotton swab dipped in alcohol; spray with horticultural oil in early morning or evening
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Improve drainage, reduce watering frequency, repot in fresh cactus soil if stems are mushy; trim affected roots
Uses
Not edible
CulinaryCrown of Thorns is ornamental only and not suitable for consumption due to toxic sap. [source]
Ornamental houseplant and landscape accent
HouseholdCrown of Thorns is grown indoors as a long-flowering potted plant and outdoors as a shrubby border or specimen plant in warm climates. Its colorful bracts and year-round blooming make it valued for interior decoration and tropical/Mediterranean garden design. [source]
Cut flower arrangements
HouseholdThe vibrant bracts and flower clusters last well in vase arrangements when cut from mature plants. Seal cut stems with warm water or cauterize with flame to prevent sap leakage. [source]
Traditional medicine uses
MedicinalIn some cultures, Crown of Thorns has been used traditionally to treat skin conditions and wounds, though scientific evidence is limited and the plant is toxic if ingested. [source]
Pollinator attractor
WildlifeThe bright flowers attract butterflies and bees, making it beneficial for pollinator-dependent gardens. It provides nectar for various insect species in warm climates. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Crown of Thorns is ornamental; harvest by removing cut flowers or bracts for indoor arrangements. Cut stems cleanly with sharp pruners. Note: Plant sap is mildly toxic and irritating; wear gloves and wash hands after handling. Wear eye protection when cutting due to thorns.
Fun Facts
- 🌱 Crown of Thorns is native to the arid regions of Madagascar and is named for its resemblance to the crown worn by Christ in Christian tradition.
- 🌱 The plant can live for decades and become quite woody and tree-like with proper care; some specimens over 20 years old develop thick, sculptural trunks.
- 🌱 All parts of the plant contain a milky sap that can cause skin irritation and gastrointestinal upset if ingested; wear gloves when handling to avoid contact dermatitis.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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