Euphorbia trigona, commonly known as the African milk tree, cathedral cactus, or Abyssinian euphorbia, is a flowering plant species originating from Central Africa. This succulent shrub is characterized by its upright stem and numerous upward-growing branches. It is a popular choice for both indoor and outdoor settings due to its unique appearance and relatively easy care.
Habitat and Distribution
Native to Angola, Congo, Gabon, Malawi, and Zaire, the African milk tree is typically found in dry tropical forests. It thrives in warm, tropical, subtropical, and arid regions, making it a versatile ornamental plant worldwide. In some areas, like India, it has escaped cultivation and now grows in disturbed areas and roadsides, forming dense thickets.
Distinctive Features
The African milk tree is easily recognizable by its distinct shape. The stem and branches can have two or three sides, with the stem itself being dark green and marked with V-shaped light green patterns. Key features include:
- Stems: Vertically growing, with a main woody "tree trunk" developing as the plant matures.
- Thorns: 5 mm (1⁄4 in) thorns occur in pairs on the stem's ridges.
- Leaves: Drop-shaped leaves grow from between the two thorns on each ridge.
- Height: Can reach up to 10 feet tall under favorable conditions, but typically grows to about 6 feet indoors.
- Color: Stems and branches are dark green, becoming brighter with more light. A popular variety, Euphorbia trigona 'Rubra' (also known as Euphorbia trigona 'Royal Red'), features both green and magenta-purple hues.
The specific epithet, trigona, means "three angled" or "triangular," referring to the species' three-sided stems. The common name, African milk tree, comes from its native region and the milky sap it produces.
Cultivation and Care
Caring for an African milk tree is straightforward, akin to caring for a typical cactus. Here are some essential tips:
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- Soil: Prefers loose, well-draining soil that is moderately fertile. A cactus or succulent potting mix is recommended for potted plants.
- Water: Requires occasional, deep watering. Allow the soil to completely dry out between waterings. It's better to underwater than overwater.
- Sun: Thrives in full sun in temperate regions and requires bright indirect light when grown indoors.
- Temperature: Can withstand temperatures down to frost (= 32 degrees Fahrenheit) for a short period. Most species prefer a warm environment between 65 to 85 degrees Fahrenheit. Outdoor plants should be brought indoors before temperatures drop below 45 degrees Fahrenheit.
To prevent the plant from falling over due to its shallow roots, plant it deep in the soil or use heavy pots made of terracotta rather than light materials like plastic.
Propagation
Propagating the African milk tree is similar to propagating a typical cactus. Follow these steps:
- Carefully cut off a stem with gloves and tools since it will leak poisonous, white sap.
- Allow the stem cutting to dry out for several days to prevent rot.
- Plant the cutting in well-draining soil.
African Milk Tree Propagation - How to get your cutting and root it in soil successfully
Potential Problems
While generally pest-free, the African milk tree can be susceptible to certain issues:
- Overwatering: The main issue is overwatering, which can lead to root rot.
- Pests: Monitor for mealybugs, aphids, and spider mites.
Good air circulation is essential to avoid fungal diseases.
Toxicity
As with many other Euphorbia species, the latex from the plant is poisonous and can cause skin irritations. Exercise caution when handling the plant, and keep it out of reach of pets and children.
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Uses
The African milk tree is versatile in its uses:
- Ornamental Plant: Frequently grown in pots indoors and used as a statement piece.
- Hedge: Some people use it as a hedge since it grows densely and has spines.
- Garden: In warm and dry regions, it can be grown outdoors, providing a nice vibrant color to the garden year-round.
Consider the African milk tree as an ornamental either indoors or outdoors. It could be used in a sunroom or office space. In warmer climates, it could be used as a hedge or in a rock garden.
Summary Table
| Feature | Description |
|---|---|
| Common Names | African Milk Tree, Cathedral Cactus, Abyssinian Euphorbia |
| Scientific Name | Euphorbia trigona |
| Origin | Central Africa |
| Height | Up to 10 feet (outdoors), 6 feet (indoors) |
| Light | Full sun (temperate regions), bright indirect light (indoors) |
| Water | Occasional, allow soil to dry between waterings |
| Soil | Well-draining, sandy or loamy |
| Toxicity | Poisonous latex, can cause skin irritation |
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