Euphorbia inermis Mill.
Green Crown, Medusa's Head
Euphorbia inermis var. inermis, Euphorbia viperina
This species is native to South Africa. It grows in gravelly flats from Jeffreys Bay to Port Elizabeth in the Eastern Cape province.
Euphorbia inermis is a much-branched succulent with ascending finger-like branches that radiate outward from the main stem tip. The caudex grow up to 4 inches (10 cm) in diameter. The bumpy branches are up to 10 inches (25 cm) long and 0.5 inches (1.2 cm) in diameter. This species is one of the caudex-forming Euphorbias, very similar to Euphorbia esculenta and Euphorbia caput-medusae.
In spring and summer, the tips of the branches are covered with attractive small flowers with a woolly appearance. Fruits are 3-chambered capsules with dark brown seeds.
USDA hardiness zone 9a to 11b: from 20 °F (−6.7 °C) to 50 °F (+10 °C).
How to Grow and Care
Euphorbias are very easy to care for. They 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. If you are growing them in containers or your soil is poor, feed them with a half-strength fertilizer monthly.
Euphorbia can be grown from seed, but they can be difficult to germinate (or even find). It is usually propagated by cuttings. This can be tricky because of the exuding sap. Rooting hormone is recommended with Euphorbias.
See more at How to Grow and Care for Euphorbia.
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