Crown of Thorns (Euphorbia splendens) Care: Treat Like a Cactus—Sun, Sandy Soil, Minimal Water, Caution with Toxic Sap

Critical Warning

White milky sap is very poisonous. Wear gloves, wash hands after any contact.

Care

• Light: Sunny south window, coverings open dawn to dusk.
• Soil: Cactus mix or ½ potting soil + ½ play sand.
• Water: Growth cycle: weekly. Dormant: monthly. Always let soil dry completely.
• Pot: Must have drainage hole; never let saucer hold water.
• Repot: Only when severely rootbound, only Apr 15–Jun 30.