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Euphorbia susannae (Suzanne's Spurge)

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Scientific Name

Euphorbia susannae Marloth

Common Names

Suzanne's Spurge

Synonyms

Euphorbia suzannae

Scientific Classification

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

Description

Euphorbia susannae is a small, clustering Euphorbia which makes dome-like clumps up to 4 inches (10 cm) tall and up to 12 inches (30 cm) in diameter. The chubby stems have rows of tubercles running up their sides, with each tubercle tapering to a thread-like point. On older stems the points are often worn off so that the tubercles are rounded at the tip. The stem is green, becoming brown-tinged in strong light. The cyathia are held atop short stalks which emerge between the tubercles. Each cyathium consists of a cup with 5 lobes around the outside and the tiny flowers in the middle. They appear in fall or spring. The small, round seed capsules which follow are purplish-red.

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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 they cannot tolerant 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.

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.

Learn more at How to Grow and Care for Euphorbia.

Origin

Euphorbia susannae is native to South Africa (Cape Province).

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