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, forming a dense clump with age. The stems can grow up to 4.9 feet (1.5 m) tall and 6 inches (15 cm) in diameter. The stem color varies from blue-grey to grey-green. The spine-like structures are dried remnants of the cyathia stalks. They are rigid and can reach up to 1.6 inches (4 cm) in length.
The solitary cyathia are 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. 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.
Links
- Back to genus Euphorbia
- Succupedia: Browse succulents by Scientific Name, Common Name, Genus, Family, USDA Hardiness Zone, Origin, or cacti by Genus
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