Crown of Thorns
Euphorbia milii
A spiny succulent shrub from Madagascar prized for its near year-round display of small, brightly colored bracts surrounding tiny flowers. Tough and drought-tolerant, with thorn-armored stems and milky sap.
- Light
- Full sun to bright light
- Water
- When soil dries; drought tolerant
- Difficulty
- Easy
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Overview
Crown of Thorns is a woody, succulent member of the spurge family native to Madagascar. It earns its name from the dense, sharp spines that armor its stems, long associated in legend with the biblical crown of thorns.
What most people take for flowers are actually showy paired bracts in red, pink, yellow, or white, framing the true, inconspicuous flowers at their center. With enough light it can bloom almost continuously, making it a rewarding, low-effort plant for sunny spots.
How to identify it
Look for a sprawling, semi-woody succulent with stout, thorn-covered stems and sparse foliage clustered near the tips.
- Stems: grey-brown, succulent, densely covered in sharp black spines up to 1 inch long
- Leaves: bright green, teardrop-shaped, mostly at branch ends and often shed in drought
- Bracts: paired, kidney-shaped, in red, pink, yellow, or white; the eye-catching 'flowers'
- Sap: milky white latex that oozes from any cut or break
- Size: typically 2-3 ft as a houseplant, up to 5-6 ft in the ground
Care & growing
Light: Give it as much sun as possible; at least 3-4 hours of direct light keeps it blooming.
Water: Let the soil dry between waterings and water sparingly in winter. Overwatering causes root and stem rot.
Soil: Fast-draining cactus or succulent mix.
Temperature: Prefers 65-85F; protect from frost.
Feeding: A diluted balanced fertilizer monthly during active growth.
Propagation: Take stem cuttings, let the cut sap dry and callus for a few days, then root in dry succulent mix.
Habitat & origin
Native to Madagascar, where it grows in rocky, sun-baked scrubland and tolerates long dry spells.
It has naturalized in many warm regions and is widely grown as a hedge or border plant in tropical and subtropical gardens. In cooler climates it is kept as a sunny windowsill or patio container plant, brought indoors before frost.
Frequently asked questions
Why won't my Crown of Thorns bloom?
Almost always insufficient light. Move it to your brightest window or outdoors in summer; it needs several hours of direct sun to flower well.
Why are the leaves dropping?
Leaf drop is normal during drought, cold, or sudden environmental change. New leaves regrow at the stem tips once conditions improve.
How often should I water it?
Only when the soil has dried out, roughly every 1-2 weeks in summer and much less in winter. It tolerates drought far better than soggy roots.
Crown of Thorns guides
In-depth guides for identifying, growing, and caring for Crown of Thorns.
