Euphorbia Cactus Rotting: Cut Black Parts with Full Protection

Identification

6-foot "cactus" bending, drying, blackening = Euphorbia (milky sap). Light move didn't help.

Surgery

1. Full PPE: Gloves, goggles, long sleeves, mask.
2. Cut above black rot (sterile tool, alcohol between cuts).
3. Dust with sulfur.
4. Callus pieces 2 weeks.
5. Pot green sections in cactus mix.

Toxicity Warning

Sap ranges from irritant to deadly by species. Treat all as hazardous. Wash skin immediately.

Light Wasn't the Issue

Rot from overwatering/cold, not low light. Euphorbias need bright light but rot kills faster.