Euphorbia guentheri (Pax) Bruyns
Euphorbia guentheri, also known as Monadenium guentheri, is a succulent plant with long cylindrical stems with prominent spine-tipped tubercles and fleshy sickle-shaped deciduous leaves. The stems are unbranched, up to 3 feet (90 cm) long, and up to 0.4 inches (2 cm) in diameter. Leaves are fleshy, up to 3.2 inches (8 cm) long, and up to 0.7 inches (1.8 cm) wide. Flowers are small with a red rim-like gland and enclosed in 2 fused greenish-white bracts with lovely purple mottling.
USDA hardiness zone 8b to 10b: from 15 °F (−9.4 °C) to 40 °F (+4.4 °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 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. Feed with a half-strength fertilizer monthly if you are growing them in containers or your soil is poor.
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. 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.
This species is native to Kenya.
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