Pencil Cactus (Euphorbia tirucalli) is not a true cactus but a striking succulent shrub of slender, pencil-thick green stems that branch densely into a coral-like, almost leafless silhouette. Fast-growing and very drought-hardy, it makes a bold architectural specimen for pots and warm gardens, and the popular 'Firesticks' form flushes orange-red in cool sun. Common across India as a hedge and folk-medicine plant, it tolerates heat and neglect with ease. IMPORTANT: its milky white sap is highly caustic and toxic, irritating skin and eyes severely - always wear gloves and keep away from pets and children.
Specifications
| Family |
Euphorbiaceae |
| Native region |
Africa and India |
| Mature height |
1-5 m (much smaller potted) |
| Mature spread |
1-2 m |
| Growth rate |
Fast |
| Foliage |
Pencil-thin green succulent stems |
| Flower colour |
Tiny yellow (insignificant) |
| Flower season |
Winter |
| Climate zone |
Tropical to subtropical, arid |
Care guide
| Sunlight |
Full sun to bright light. |
| Watering |
Soak-and-dry; very drought-tolerant, water sparingly. |
| Soil / mix |
Gritty, fast-draining sandy/cactus mix. |
| Temperature |
10-40 C; protect from frost. |
| Humidity |
Low. |
| Fertilizer |
Light succulent feed once or twice a year. |
| Pruning |
Prune with gloves and eye protection; sap is caustic. |
| Repotting |
Every 2-3 years; handle with gloves. |
| Propagation |
Stem cuttings (wear gloves; rinse sap, let callus). |
| Pests & problems |
Mealybugs; generally pest-resistant. |
| Toxicity / safety |
Highly toxic - caustic milky sap irritates skin/eyes. |
| Difficulty |
Very easy (handle with care) |
Uses
A dramatic architectural specimen for sunny pots, courtyards and xeriscapes, and a traditional living hedge; the Firesticks form is grown for its orange winter colour.
Growing tips
In India it thrives outdoors in full sun with minimal care; always wear gloves and eye protection when cutting, and rinse cut surfaces before propagating to manage the caustic sap.