Crown of Thorns
Euphorbia milii
Family: Euphorbiaceae
A medium upright plant from the Euphorbiaceae family. Easy to care for and forgiving of occasional neglect.
Complete Care Guide
Light Requirements
Best near south or west-facing windows with sheer curtains. Wants lots of light but not direct sun rays hitting leaves.
Watering
Very drought-tolerant. Allow soil to dry completely between waterings. Overwatering is the primary cause of death for this plant.
Typical schedule: every 14 days (adjust for season and environment).
Humidity
Tolerates dry air without issue. No special humidity measures needed — works great in air-conditioned or heated rooms.
Temperature
Keep between 50–85°F (10–29°C). Avoid cold drafts, heating vents, and sudden temperature changes. This plant tolerates cooler temperatures better than most.
Size & Growth
Mature size: approximately 31 inches tall × 18 inches wide. Growth rate is moderate. Habit: upright.
Difficulty Level: 2/5
Easy to moderate care. Forgiving of minor mistakes but benefits from consistent attention. Good for beginners ready for a small step up.
Quick Tips
- ✓Water every 14 days approximately
- ✓Prefers bright indirect light
- ✓Tolerates dry air
- ✓Temperature: 50-85°F
Common Problems & Solutions
Yellowing leaves
Cause: Overwatering or sitting in waterlogged soil
Fix: Let soil dry completely before watering. Ensure pot has drainage holes. Reduce watering frequency.
Pale or leggy growth
Cause: Insufficient light — plant is stretching toward the nearest light source
Fix: Move to a brighter location. Rotate plant quarterly for even growth.
Drooping or wilting
Cause: Usually overwatering causing root rot
Fix: Check roots for rot. Reduce watering. Repot in fresh, well-draining soil if needed.
Toxic to Pets
Crown of Thorns is toxic to cats and dogs. Ingestion may cause oral irritation, excessive drooling, vomiting, and difficulty swallowing. Keep this plant out of reach or consider a pet-safe alternative.
Browse pet-safe alternatives →Frequently Asked Questions
Is Crown of Thorns safe for cats and dogs?▼
No — Crown of Thorns is toxic to both cats and dogs. If ingested, it may cause oral irritation, drooling, vomiting, or difficulty swallowing. Keep out of reach of pets or choose a pet-safe alternative.
How often should I water Crown of Thorns?▼
Water approximately every 14 days, but always check the soil first. Very drought-tolerant. Allow soil to dry completely between waterings. Overwatering is the primary cause of death for this plant. Adjust frequency based on season — less in winter, more in summer.
How much light does Crown of Thorns need?▼
Crown of Thorns prefers bright indirect conditions. Best near south or west-facing windows with sheer curtains. Wants lots of light but not direct sun rays hitting leaves.
How big does Crown of Thorns get?▼
Indoors, Crown of Thorns typically reaches about 31 inches (79 cm) tall with a spread of around 18 inches. Growth rate is moderate. Size depends on pot size, light, and care.
Is Crown of Thorns good for beginners?▼
Yes! With a difficulty rating of 2/5, Crown of Thorns is very forgiving and suitable for beginners. It tolerates imperfect conditions and bounces back from mistakes.
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