The genus Euphorbia is one of the giants of the plant world, with roughly 2 000 species ranging from tiny annual “weeds” to sizeable shrubs and trees.

Many of the most charismatic members are the succulent spurges of Africa, where thickened, photosynthetic stems and water-storing roots allow them to thrive in semi-arid Karoo, savanna and bushveld landscapes. At a glance many of these plants are easily mistaken for cacti, yet they belong to a completely different family and are united instead by their unique flower structure, the cyathium – a tiny cup that holds the actual male and female flowers and nectar glands.

Almost all Euphorbia species exude a milky white latex when damaged. This sap has helped the genus to succeed as it seals wounds and has antifungal and antibacterial properties, but it is also irritating and sometimes highly toxic to skin, eyes and mucous membranes, so care and gloves are strongly recommended when pruning or transplanting.

For South African gardeners and collectors, the succulent euphorbias offer tough, water-wise structure for rock gardens, containers and xeriscapes. Their sculptural stems, intricate spination and neat clusters of yellowish cyathia are especially striking in late spring and summer. The species below are all South African endemics with fascinating forms and restricted natural distributions, making them rewarding subjects to grow from seed and a meaningful contribution to ex-situ conservation when sourced responsibly.

Euphorbia fortuita – Medusa euphorbia

This medusoid species forms a squat caudex at soil level from which stiff, cylindrical branches radiate in all directions, creating a striking “sea urchin” or “Medusa’s head” effect in a pot. The branches are usually around 8–10 cm long, sometimes longer, and are neatly patterned with low tubercles and small spine-like remnants, giving the plant a textured, armour-like appearance without being dangerously spiny.

In nature Euphorbia fortuita is a South African endemic from the Little Karoo of the Western Cape, with its type locality between Ladismith and Barrydale.

It grows in very rocky, arid habitats with extreme temperature fluctuations and episodic rainfall, conditions that have shaped it into a tough survivor. Despite this resilience, the species has a relatively narrow range and faces pressure from illegal collection for the specialist succulent trade; it is currently assessed as Endangered.

In cultivation, E. fortuita produces small yellow to yellow-green cyathia near the tips of its branches, most freely in spring and early summer once the plant is well established.

Under South African conditions it appreciates full sun to very bright light, a gritty, mineral-rich mix and careful watering: regular deep drinks in the warmer months followed by a drier, almost dormant winter rest. Grown from seed, plants quickly develop a characterful caudex and a radiating crown of branches that sits beautifully in a shallow bonsai or “cracked bark” container, making an ideal centrepiece for a Karoo-style container or a serious succulent collection.