Euphorbia trigona, commonly known as the African milk barrel or the triangle cactus, is a striking succulent plant native to Africa. It features upright, triangular stems that can grow up to 1.5 metres tall, showcasing a rich green colour with pronounced ridges and small spines along the edges. This hardy plant is known for its low maintenance needs, thriving in bright light and well-drained soil. Euphorbia trigona produces small, inconspicuous flowers, typically appearing at the tips of the stems. While it is an attractive addition to indoor and outdoor gardens, care should be taken, as the milky sap can be toxic if ingested.

Light

Euphorbia trigona, commonly known as the African milk barrel cactus, thrives in bright, indirect sunlight. It can tolerate direct sunlight but should be acclimatised gradually to prevent sunburn. A south or east-facing window is ideal for optimal growth.

Soil

Use well-draining soil to prevent root rot. A cactus or succulent potting mix, or a blend of potting soil and sand, works well. Ensuring good aeration in the soil is crucial for the health of the plant.

Watering

Water thoroughly during the growing season (spring and summer) when the top 2-3 inches of soil are dry. During the dormant season (autumn and winter), reduce watering significantly, allowing the soil to dry out completely before the next watering. Overwatering can lead to root rot.

Temperature and Humidity

Euphorbia trigona prefers temperatures between 18°C and 24°C (65°F to 75°F). It can tolerate slightly cooler temperatures, but do not expose it to temperatures below 10°C (50°F). This plant thrives in low to moderate humidity levels, making it suitable for average household conditions.

Fertilising

Feed the plant with a balanced liquid fertiliser diluted to half strength every 4-6 weeks during the growing season. Avoid fertilising in the dormant months.