Euphorbia tirucalli

Madagascan origin and worldwide introduction of Euphorbia tirucalli

Euphorbia tirucalli is native to Madagascar. It has been widely introduced through tropical and subtropical Africa, Asia and many islands.

In places where it has been introduced, it grows on dry hills, rocky ground, open savanna and disturbed sites.

Growing Euphorbia tirucalli indoors

• Pruning and repotting: Repot when roots fill the pot or the plant becomes unstable, using a heavier pot as it grows. Shorten selected branches to manage size, and wear gloves and eye protection because every cut releases irritating latex.
• Light: Give the plant a sunny indoor position and introduce stronger direct sun gradually.
• Watering: Water thoroughly once the potting mix is fully dry. When new branches slow down and the pot takes longer to dry, leave more time before watering again.
• Potting mix: A sandy, gritty succulent mix suits the woody base and lets excess water drain quickly.
• Temperature: Keep this species above about 10 °C and frost-free. A warm room suits it well.
• Humidity and airflow: Ordinary household humidity is sufficient. Good airflow through the fine branching is useful.
• Feeding: Give a light dose of succulent fertiliser while new branches are growing, and pause feeding when visible growth stops.
• Propagation: Pencil branches root readily after the cut surface has dried. Wear gloves and eye protection, and keep fresh sap away from skin, eyes and mouth.

Troubleshooting Euphorbia tirucalli

• The woody base becomes soft or blackened: A soft or blackened woody base is a common sign of rot after the potting mix has stayed wet too long. Stop watering and cut away all rotten roots or stems with a clean tool until only firm, healthy tissue remains. Discard the rot and let the cuts seal before rooting healthy branches.
• Many green branches wrinkle at the same time: Check the potting mix and roots. If the mix is dry and the roots are firm, water thoroughly. If roots are soft or smell sour, cut away all soft or rotten roots with a clean tool until only firm, healthy tissue remains. Discard the rotten material and let the cuts seal before repotting in fresh mix.
• New growth becomes long, thin and sparse: Long, thin and sparse new growth often develops when the light level is too low. Move it gradually toward a brighter window so later growth becomes more densely branched.
• A branch snaps and exposes fresh latex: Make a clean cut if the break is ragged and keep the wound dry while it seals. Protect skin and eyes during cleanup and wash any sap from skin promptly.

Euphorbia tirucalli is toxic to people and pets

• Keep this plant away from children, cats and dogs, and avoid contact with its milky sap.
• The sap contains irritating diterpene esters that can burn the mouth and damage skin or eyes.
• Sap exposure may cause painful irritation, while swallowing plant material can cause vomiting or stomach pain. Contact a veterinarian or medical professional promptly, especially after eye exposure.

What does the name Euphorbia tirucalli mean?

Euphorbia honours Euphorbus. Tirucalli preserves a South Asian vernacular name for the plant.

Carl Linnaeus established the genus Euphorbia in 1753 in Species Plantarum, page 450.

Carl Linnaeus first described Euphorbia tirucalli in 1753 in Species Plantarum, page 452.