Candelabra Tree: Africa’s Toxic “Cactus” That Defies Evolution

Driving through the rocky hills and savannas of southern Africa, you might do a double-take when you spot what looks like a massive cactus towering over the landscape. But look closer, and you’ll discover one of nature’s most fascinating examples of evolutionary mimicry.

Meet the Candelabra Tree (Euphorbia ingens), a spectacular succulent that has evolved to look almost identical to the cacti of the Americas, despite being completely unrelated. With its striking, multi-branched silhouette reaching toward the sky and its highly toxic milky sap, this tree is both a botanical masterpiece and a potent reminder that beauty in nature often comes with a warning label.

Common Name(s): Candelabra Tree, Candelabra Euphorbia, Common Candelabra Tree, Giant Candelabra Tree

Scientific Name: Euphorbia ingens

Type: Plant – Angiosperm (flowering plant) – Succulent Tree (Family: Euphorbiaceae)

Origin and Distribution: Native exclusively to southern Africa. Its range covers a wide swath of the region, including South Africa (particularly the Northern Cape, North West, Gauteng, Mpumalanga, Limpopo, and Free State provinces), Botswana, Namibia, Zimbabwe, and southern Mozambique.

Habitat: Thrives in hot, dry environments with well-drained soils. It is commonly found on rocky hillsides, granite outcrops (kopjes), savanna woodlands, and arid bushveld. It often grows in areas with shallow, stony soils where other trees struggle to survive. It avoids waterlogged areas and dense, shaded forests, preferring full sun and excellent drainage.

Physical Description: The Candelabra Tree is an impressive sight, typically growing 6 to 12 meters (20 to 40 feet) tall, though exceptional specimens can reach even greater heights. Its most distinctive feature is its branching pattern: thick, columnar stems rise from a central trunk and repeatedly branch upward and outward in a symmetrical, candelabra-like fashion.

The stems are 5-angled (pentagonal) with sharp spines running along the ridges, and they are a grey-green to blue-green color. The small, oval leaves are deciduous, appearing only briefly after rain before dropping to conserve water. The tree produces small, yellow-green flowers (cyathia) along the upper stems, followed by three-lobed capsule fruits. When cut or damaged, it exudes a copious, white, milky latex that is highly toxic and caustic.

History and Cultural Significance: The Candelabra Tree has long been recognized by indigenous peoples of southern Africa, though its toxic properties have generally limited its practical uses. The San and Khoikhoi peoples historically used the poisonous latex in very small, carefully prepared amounts as an arrow poison for hunting, though this practice required extensive knowledge to avoid self-harm.

The latex was also occasionally used as a fish stupefiant (to stun fish for easier capture) and in traditional medicine for treating warts and skin conditions, though such uses are extremely dangerous and strongly discouraged today. In modern times, the tree has become a popular ornamental specimen in xeriscape gardens worldwide and a symbol of the unique, resilient flora of the African bushveld.

Behavior and Lifestyle: As a succulent tree, the Candelabra Tree is masterfully adapted to survive in harsh, arid conditions. Its thick, fleshy stems store water for use during prolonged droughts, and its reduced leaf surface area minimizes water loss through transpiration. The tree is slow-growing but remarkably long-lived, with some specimens likely surviving for over a century.

The tree’s flowering is typically triggered by seasonal rains, with the small yellow-green cyathia appearing in late spring or early summer. These unusual flowers are actually highly specialized inflorescences unique to the Euphorbia genus, containing both male and female reproductive structures. The tree is pollinated by insects, particularly bees and wasps, attracted to the nectar produced by the flowers.

The tree’s most famous (or infamous) characteristic is its toxic latex. This milky white sap contains diterpene esters and other compounds that are severely irritating to skin and mucous membranes. Contact with the eyes can cause temporary or even permanent blindness, and ingestion can be fatal. This potent chemical defense protects the tree from herbivores, though a few specialized insects have evolved to feed on it without harm.

Conservation Status and Threats: The Candelabra Tree is currently listed as “Least Concern” on the IUCN Red List, reflecting its wide distribution and relatively stable populations across southern Africa. However, localized threats exist, including habitat loss due to mining (particularly in areas rich in minerals like platinum and chrome), urban expansion, and over-collection for the ornamental plant trade.

Climate change, leading to more frequent and severe droughts in southern Africa, could also impact the tree’s long-term survival, though its exceptional drought tolerance makes it more resilient than many other species.

Fun Facts / Did You Know?

• Convergent Evolution Masterclass: The Candelabra Tree looks almost identical to the candelabra cacti of the Americas (like Euphorbia lactea‘s relatives), despite the two plant families diverging evolutionarily over 100 million years ago. This is a textbook example of convergent evolution, where unrelated species evolve similar traits to adapt to similar environments.
• Not a Cactus: Despite its cactus-like appearance, the Candelabra Tree belongs to the spurge family (Euphorbiaceae), which includes plants as diverse as poinsettias, rubber trees, and castor beans. True cacti are native only to the Americas.
• Blindness Risk: The latex is so caustic that traditional healers who worked with it would often suffer eye damage. Modern medical literature contains numerous case studies of people who accidentally got the sap in their eyes, resulting in excruciating pain and vision loss.
• Architectural Inspiration: The tree’s striking, symmetrical branching pattern has inspired architects and designers worldwide, appearing in modern sculptures, garden designs, and even building structures that mimic its natural geometry.
• Fire Survivor: While the latex is flammable, the tree’s thick, water-storing stems allow it to survive low-intensity bushfires that would kill many other plants, making it a resilient component of fire-prone savanna ecosystems.
• Edible Seeds (Carefully): While the latex is deadly, the seeds themselves, once properly processed to remove all traces of toxic compounds, have been consumed in times of extreme famine, though this is extremely dangerous and not recommended.

Best Places to See It in the Wild:

• Magaliesberg Mountains (South Africa): The rocky slopes and outcrops of this beautiful mountain range near Johannesburg are dotted with spectacular Candelabra Trees.
• Pilanesberg National Park (South Africa): The ancient volcanic crater and surrounding bushveld provide ideal habitat, and the trees are commonly seen along game drive routes.
• Matobo Hills (Zimbabwe): The iconic granite kopjes of this UNESCO World Heritage Site are home to many mature specimens growing among the rocks.
• Tsodilo Hills (Botswana): These sacred hills in the Kalahari feature Candelabra Trees growing in the rocky terrain, adding to the area’s dramatic landscape.
• Private Reserves in Limpopo and Mpumalanga: Many reserves in these provinces showcase the tree as part of their characteristic bushveld scenery.