Euphorbia susannae

Origin

Euphorbia susannae is native to South Africa, specifically concentrated in the Little Karoo region (Western Cape Province). It is found in a relatively small area between Ladismith and Barrydale. The species was discovered in 1925 by Dr. John Muir and named in honor of his wife, Susanna Muir. Due to its popularity in the succulent trade, it is widely cultivated, though it remains a protected species in its natural habitat.

Habitat

In the wild, this species thrives in arid, gravelly plains and flat areas dominated by quartz and ironstone. It typically grows partially buried in the soil or tucked under the shade of small karroid bushes to protect itself from the intense African sun. The habitat is characterized by extremely low rainfall, which occurs mostly in winter, and well-drained, sandy, or mineral-rich soils.

Description

Euphorbia susannae is a dwarf, multi-headed succulent that is highly prized for its "clumping" growth habit and geometric precision.

• Growth Habit: It starts as a solitary, globe-shaped stem but quickly produces offsets from the base, eventually forming a dense, rounded cushion-like clump that can reach 15–20 cm in diameter.

• Stems: Each individual head is roughly spherical to cylindrical, typically 12 to 20-angled. The stems are grayish-green to dark green, often developing a purplish tint when exposed to bright light or cold temperatures.

• Tubercles & Bristles: Each ridge is lined with prominent, downward-pointing tubercles (bumps). At the tip of each tubercle is a soft, harmless bristle rather than a sharp spine, making it much friendlier to handle than many other Euphorbias.

• Flowers: It produces small, yellowish-green cyathia (flowers) that emerge from the apex of the stems during the autumn and winter months. The flowers have a distinct, slightly sweet scent.

• Root System: It possesses a thick, fleshy taproot which acts as a water reservoir, allowing it to survive long periods of drought.

Cultivation Tip: This species requires excellent drainage. Use a potting mix with high grit content (pumice or perlite) and ensure the plant receives bright, indirect sunlight. Allow the soil to dry out completely between waterings to prevent root rot, especially during its dormant summer period.