Euphorbia triangularis, commonly known as the Triangular Euphorbia or African Milk Tree, is a striking succulent native to Central Africa. It is characterised by its tall, upright stems that are triangular in cross-section, with prominent ridges and spines along the edges. The plant's green stems may have lighter green or reddish markings, adding to its visual appeal. Known for its architectural form and ease of care, Euphorbia triangularis makes a dramatic statement as a focal point in both indoor and outdoor settings.
With proper care, Euphorbia triangularis can thrive and become a striking feature in any plant collection. Its unique triangular stems and architectural form make it an excellent choice for adding a touch of exotic elegance to both home and garden settings.
Light
Prefers bright, indirect light.
Can tolerate direct sunlight, which can enhance growth and coloration.
For indoor settings, place near a south or west-facing window to provide ample light.
Water
Water sparingly; allow the soil to dry out completely between waterings.
During the growing season (spring and summer), water thoroughly but infrequently.
Reduce watering in the winter when the plant’s growth slows down.
Humidity
Thrives in low to moderate humidity levels.
Adaptable to average indoor humidity.
Avoid overly humid environments to prevent root rot.
Temperature
Ideal temperature range: 16-27°C.
Can tolerate higher temperatures but needs protection from frost and temperatures below 10°C.
Prefers a warm, dry environment for optimal growth.
Soil
Use a well-draining potting mix, specifically formulated for succulents and cacti.
Ensure the pot has drainage holes to prevent waterlogging.
A mix of potting soil, perlite, and coarse sand works well.
Fertilisation
Feed sparingly; use a balanced, water-soluble fertiliser diluted to half strength.
Fertilise once a month during the growing season (spring and summer).
Do not fertilise during the winter dormant period.
Repotting
Repot every 2-3 years or when the plant outgrows its pot.
Choose a slightly larger pot with good drainage.
Refresh the soil during repotting to provide new nutrients.
Pruning
Prune to remove any dead or damaged stems.
Wear gloves when pruning to avoid the plant’s spines and milky sap, which can irritate the skin.
Remove unwanted branches to maintain the desired shape and size.
Pests
Watch for common pests such as spider mites, mealybugs, and scale insects.
Treat infestations with insecticidal soap or neem oil if needed.
Ensure good air circulation around the plant to help prevent pest issues.
Propagation
Easily propagated through stem cuttings.
Allow cuttings to callous over for a few days before planting in well-draining soil.
Keep cuttings in bright, indirect light and water sparingly until roots develop.