Crown of Thorns
Euphorbia milii
houseplantCrown of Thorns is a succulent shrub native to Madagascar, prized for its vibrant flowers and dramatic spiny stems. It thrives indoors as a low-maintenance houseplant that blooms prolifically with proper light and care. The plant is toxic and should be kept away from children and pets.
Common Problems
Select the problem your Crown of Thorns is experiencing to get a treatment guide.
Care Guide
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Light
Bright, direct sunlight for 6+ hours daily; flowering is enhanced by maximum light exposure.
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Water
Water when top 1–2 inches of soil are dry; reduce watering in winter. Allow soil to dry between waterings to prevent root rot.
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Soil
Well-draining cactus or succulent potting mix; add perlite if using regular potting soil.
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Fertiliser
Feed monthly during growing season (spring/summer) with balanced or flowering plant fertilizer; reduce in fall/winter.
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Temperature
Prefers 65–75°F (18–24°C); avoid temperatures below 50°F (10°C).
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Humidity
Low to moderate humidity is acceptable; avoid excessive moisture around foliage.
Toxicity
dangerousToxic to CatsdangerousToxic to DogsdangerousToxic to Children
All parts contain toxic sap that can cause skin irritation and gastrointestinal upset if ingested. Wear gloves when handling.
Common Diseases
Common Pests
Seasonal Care
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Resume regular watering and feeding as growth picks up.
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Peak growing season. Water and feed regularly.
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Reduce watering as growth slows. Stop heavy feeding.
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Minimal watering and feeding. Protect from frost if needed.