Euphorbia horrida (African Milk Barrel)

Scientific Name

Euphorbia horrida Boiss.

Common Name(s)

African Milk Barrel

Synonym(s)

Euphorbia horrida var. horrida

Scientific Classification

Family: Euphorbiaceae
Subfamily: Euphorbioideae
Tribe: Euphorbieae
Subtribe: Euphorbiinae
Genus: Euphorbia

Description

Euphorbia horrida is a clump-forming succulent with erect cylindrical stems with 10 to 20 flattened, often wavy ribs armed with orange or grey, spine-like structures. It offsets from the base to form a clump. The stem color varies from blue-grey to grey-green. They are up to 4.9 feet (1.5 m) tall and 6 inches (15 cm) in diameter. The spine-like structures are dried remnants of the cyathia stalks. They are rigid and up to 1.6 inches (4 cm) long. Cyathia are solitary, green-yellow, and appear along the ribs at the apex of the stems in summer.

Hardiness

USDA hardiness zones 9b to 11b: from 25 °F (−3.9 °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 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. Feed with a half-strength fertilizer monthly if you are growing them in containers or your soil is poor.

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.

See more at How to Grow and Care for Euphorbia.

Origin

This species is native to South Africa.

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