Crown of Thorns (Euphorbia milii) is a hardy succulent shrub with thick, woody, sharply spined stems and small oval green leaves clustered near the tips. Its true flowers are tiny, but they are framed by showy, long-lasting bracts in red, pink, yellow, white or coral that appear almost year-round in good light. Extremely drought-tolerant and undemanding, it is perfect for sunny windowsills, balconies, rockeries and low-water gardens. The milky sap is a skin and eye irritant and is toxic if ingested, and the spines are sharp, so handle with gloves. With minimal care it rewards growers with continuous colour and tough resilience.
Specifications
| Family |
Euphorbiaceae |
| Native region |
Madagascar |
| Mature height |
0.3-1.5 m |
| Mature spread |
0.3-0.9 m |
| Growth rate |
Slow to moderate |
| Foliage |
Small oval green leaves on spiny succulent stems |
| Flower colour |
Red, pink, yellow, white or coral bracts |
| Flower season |
Near year-round in good light |
| Climate zone |
Tropical and subtropical, arid-tolerant |
Care guide
| Sunlight |
Full sun to very bright light |
| Watering |
Let soil dry between waterings; drought-tolerant |
| Soil / mix |
Gritty, fast-draining cactus or succulent mix |
| Temperature |
Warmth 18-35C; protect from frost |
| Humidity |
Prefers low to moderate humidity |
| Fertilizer |
Dilute balanced feed monthly in growing season |
| Pruning |
Prune with gloves to shape; sap is irritant |
| Repotting |
Repot every 2-3 years in fresh gritty mix |
| Propagation |
Stem cuttings, dried before planting |
| Pests & problems |
Mealybugs, scale and spider mites occasionally |
| Toxicity / safety |
Milky sap toxic and irritant; spines sharp |
| Difficulty |
Easy |
Uses
Excellent low-water ornamental for sunny windowsills, balconies, rockeries and xeriscapes. Its spiny stems also make it a deterrent border plant.
Growing tips
In India it thrives on bright balconies and sunny ledges with minimal watering; use a gritty mix, let it dry between drinks, and it will flower nearly all year.