Pencil Cactus
Euphorbia tirucalli
Sticks on Fire
About this plant
Euphorbia tirucalli, commonly called Pencil Cactus, is a succulent shrub with thin, pencil-like green stems that sometimes turn reddish. It is popular as a decorative plant for its unique shape and low water needs. The plant produces a milky sap that is toxic and can irritate skin and eyes. It is often used in xeriscaping and as an indoor or outdoor ornamental plant in warm climates.
Taxonomy
- Genus
- Euphorbia
- Family
- Euphorbiaceae
- Higher classification
- Order Malpighiales
- Plant type
- Succulent
- Lifespan
- Perennial
Origin & Distribution
- Native region
- Africa, India
- Distribution
- Native to Africa and India; widely cultivated in warm regions worldwide.
Care
- Light preference
- Full sun
- Suitable locations
- Indoor, Outdoor, Balcony, Greenhouse
- Preferred window facing
- South-facing, West-facing, East-facing
- Watering frequency
- Rare
- Watering interval
- 14–21 days
- Humidity
- Low
- Minimum
- 5 °C
- Maximum
- 35 °C
- Optimal
- 18-27 °C
- USDA hardiness zones
- 9-11
- Soil pH
- 6.0-7.5 (slightly acidic to neutral)
- Soil type
- well-draining sandy or cactus potting mix
Watering. Water sparingly, allowing soil to dry out completely between waterings. Reduce watering in winter when the plant is dormant.
Fertilizing. Feed with a balanced, diluted fertilizer once a month during the growing season (spring and summer). Avoid fertilizing in winter when the plant is dormant.
Euphorbia tirucalli is a tough, drought-tolerant plant that thrives in bright sunlight. It needs well-draining soil and infrequent watering, making it low-maintenance. Overwatering can cause root rot, so let the soil dry out between waterings.
Propagation
- Propagation methods
- Cuttings
- Care difficulty
- Easy
Ornamental features
- Flowering
- Yes
- Flowering period
- spring
Thin, cylindrical green stems that may turn reddish; small inconspicuous flowers; unique sculptural form.
Toxicity & Safety
- Toxic to humans
- Toxic
- Toxic to pets
- Toxic
- Weed potential
- Not considered a weed
The milky sap is toxic and can cause skin irritation, eye damage, and stomach upset if ingested. Keep away from children and pets.
Allergy information
- Allergy risk
- Moderate
- Allergy triggers
- Sap or latex, Skin contact
- Pollen level
- Low
Euphorbia tirucalli can cause skin irritation if its milky sap touches your skin or eyes. People sensitive to plant latex or sap should handle it carefully and wear gloves. Avoid touching your face after handling the plant. Keep it away from children and pets to prevent accidental contact.
Common problems
Overwatering can lead to root rot. Sap contact may cause skin irritation. It may drop leaves if kept in low light or cold temperatures.
Uses
Used as an ornamental plant for its unique appearance and drought tolerance. Sometimes used in xeriscaping and as a natural fence or barrier.
Notes
Prune carefully using gloves to avoid contact with sap. Repot every 2-3 years or when root-bound. Protect from frost and cold drafts.