Euphorbia trigona Mill.
African Milk Tree, High Chaparall, Cathedral Cactus, Abyssinian Euphorbia
Euphorbia trigona is a succulent plant with an upright stem and numerous branches that also grow upward. The stem and branches are dark green with V-shaped light green patterns and have 3 to 4 ridges. The spines are reddish-brown, up to 0.2 inches (5 mm) long, and arranged in pairs of 2 on the stem's ridges. Leaves grow between the two spines on each ridge. This species has never been known to flower and is possibly a hybrid.
USDA hardiness zones 10a to 11b: from 30 °F (−1.1 °C) to 50 °F (+10 °C).
How to Grow and Care
Euphorbias are very easy to care for. These plants require a little pampering to become established, but once they are, they are self-sufficient. In fact, more die from too much care and watering than from neglect. Euphorbias need well-draining soil and lots of sunlight. They are not particular about soil pH, but they cannot tolerate wet soil. Unlike most succulents, Euphorbia does not handle long periods of drought well. It may need weekly watering during the summer. Water whenever the soil is dry several inches below the surface. Water deeply, but don't let them sit in wet soil, which can cause root rot. Add some organic matter or fertilizer to the planting hole. If you are growing them in containers or your soil is poor, feed with a half-strength fertilizer monthly.
These succulents can be grown from seed, but they can be difficult to germinate (or even find). They are usually propagated by cuttings. This can be tricky because of the exuding sap. Rooting hormone is recommended with Euphorbias. They tend to grow problem-free, but there are a few pests and diseases to be alert for.
Learn more at How to Grow and Care for Euphorbia.
Euphorbia trigona is native to West Africa.
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