Euphorbia ritchiei subsp. nyambensis (S.Carter) Bruyns
Monadenium ritchiei subsp. nyambense
This subspecies is native to Kenya. It grows on rocky slopes in Meru County at an elevation of about 3,780 feet (1,150).
Euphorbia ritchiei subsp. nyambensis, also known as Monadenium ritchiei subsp. nyambense, is a dwarf succulent that branches above ground to form a compact clump. This subspecies is quite distinct from Euphorbia ritchiei subsp. ritchiei. It is more branched and has shorter stems with shorter and rounded tubercles arranged in tight spirals. Leaves, when present, are smooth, light green, often with a purple hue, and up to 1.6 inches (4 cm) long.
The stem tips are adorned with delightful orangish-pink cyathia with a deep red margin, usually in late summer and fall. The cyathia are up to 0.25 inches (0.6 cm) long and 0.2 inches (5 mm) in diameter.
USDA hardiness zone 11a to 11b: from 40 °F (+4.4 °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 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.
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.
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