The African Milk Tree (Euphorbia trigona) is a striking, upright, columnar succulent shrub in the family Euphorbiaceae, instantly recognizable by its deeply ridged, dark green stems armed with pairs of sharp spines and occasional small, tear-shaped leaves. Despite its common name and cactus-like appearance, it is not a true cactus at all but rather a Euphorbia — a member of one of the largest and most diverse plant families on Earth. The "milk" in its name refers to the toxic, milky white latex that oozes from any cut or wound.
• Not a true tree despite its common name — it is a succulent shrub that can reach heights of 2 to 3 meters in cultivation
• The species epithet "trigona" means "three-angled," referring to the prominently three-sided (triangular) stem cross-section
• Often sold as a "good luck plant" or "friendship cactus" in garden centers worldwide
• The plant rarely flowers in cultivation and may be a naturally occurring hybrid or cultivar of uncertain wild origin
• Like all Euphorbias, it produces a toxic, caustic milky latex that serves as a chemical defense against herbivores
• Believed to be native to Gabon, though confirmed wild populations are poorly documented
• May also occur in adjacent regions of western equatorial Africa
• Grows in tropical dry forests, savanna woodland, and rocky hillsides
• The species may be of horticultural origin — some authorities suggest it is a cultivar or hybrid that has been propagated vegetatively for centuries
• First described by the French botanist Henri Ernest Baillon in 1861
• Widely cultivated throughout the tropics and subtropics as an ornamental and hedge plant
• Now found in cultivation worldwide, from tropical Africa to Southeast Asia, the Caribbean, and the Americas
Stems:
• Erect, columnar, branching from the base and along the main stems
• 3 to 5 cm in diameter, with 3 to 4 prominent longitudinal ridges (wings) giving a distinctly angular cross-section
• Dark green to grayish-green, sometimes developing a reddish or purple tinge in strong light
• Stems rise from a woody base and can reach 2 to 3 meters tall in cultivation, occasionally taller in ideal tropical conditions
Spines:
• Pairs of sharp, rigid spines 5 to 10 mm long emerging from small, shield-shaped spine shields along the stem ridges
• Spines are actually modified stipules, dark brown to black, persistent
• Between the spine pairs, small reddish-purple bract-like structures may appear
Leaves:
• Small, fleshy, lance-shaped, 5 to 12 mm long
• Dark green, produced on new growth and often deciduous during dry periods
• Leaves are relatively inconspicuous compared to the prominent stems
Latex:
• All parts exude copious amounts of white, milky latex when cut or broken
• The latex is toxic, caustic, and a potent skin and eye irritant
Habitat:
• Tropical dry forests, savanna margins, and rocky outcrops in west-central Africa
• Tolerates a range of conditions from partial shade to full sun
• Adapted to warm, humid tropical conditions with a pronounced dry season
Growth and Ecology:
• Fast-growing under ideal conditions, adding 15 to 30 cm of height per year
• Branches readily from the base and from points along the main stems, creating a dense, shrub-like habit
• In cultivation, commonly grown as a container specimen, landscape accent, or living hedge in frost-free climates
• The latex serves as a potent defense mechanism, deterring nearly all herbivores from feeding on the stems
• Shallow root system adapted to capturing surface moisture from brief rainfall events
Relationships:
• Like other Euphorbias, the latex contains diterpene esters that are toxic to most animals and cause severe irritation to human skin and eyes
• The spiny stems provide additional physical defense and also serve to shade the stem surface slightly
• In tropical settings, the plant may serve as a nesting site for small birds
Toxic Compounds:
• The latex contains diterpene esters (phorbol esters and ingenol derivatives) that are potent irritants and potential carcinogens
• Also contains complex terpenoids and euphorbol compounds
Effects on Humans:
• Skin contact: causes contact dermatitis, redness, burning, blistering, and inflammation — symptoms may be delayed by several hours
• Eye contact: extremely dangerous — can cause severe conjunctivitis, corneal burns, and potentially permanent eye damage
• Ingestion: causes burning of the mouth, throat, and digestive tract, nausea, vomiting, and diarrhea
• Inhalation of latex aerosols can cause respiratory irritation
Safety Precautions:
• Always wear gloves and eye protection when handling, pruning, or repotting this plant
• Wash hands thoroughly after any contact
• Keep away from children and pets
• If latex contacts the eyes, flush with water for at least 15 minutes and seek immediate medical attention
Soil:
• Well-draining succulent or cactus potting mix
• Use 60 to 70% inorganic material (pumice, perlite, coarse sand) blended with standard potting soil
• Good drainage is essential to prevent root rot
Light:
• Bright, indirect light to partial sun — at least 4 hours of bright light daily
• Tolerates full sun in tropical and subtropical climates, but may develop a reddish or bronzed appearance
• Indoors, a bright east or west-facing window is ideal
• Insufficient light causes weak, elongated growth and loss of the compact, upright form
Water:
• Water thoroughly during the active growing season (spring to autumn), allowing the soil to dry between waterings
• Reduce watering significantly in winter — water just enough to prevent shriveling
• Overwatering is the most common cause of death, leading to root and stem rot
Temperature:
• Prefers warm conditions (18 to 30°C) year-round
• Not frost-tolerant — must be protected from temperatures below 10°C
• Ideal for USDA hardiness zones 10 to 12, or grown as a houseplant elsewhere
Propagation:
• Easily propagated from stem cuttings taken in spring or summer
• Cut a 10 to 15 cm stem section, allow the cut end to dry and callus for 3 to 5 days to prevent rot
• Wear gloves and eye protection when taking cuttings due to the toxic latex
• Plant in well-draining soil and water sparingly until roots develop
Wusstest du schon?
Despite being commonly called the "African Milk Tree," Euphorbia trigona is not a tree at all and is only distantly related to true cacti — its cactus-like appearance is a remarkable example of convergent evolution, where unrelated plants in similar environments evolve nearly identical forms • The plant is known as the "friendship cactus" in some regions because its readily rooting stem segments are easy to share with friends and neighbors • In traditional West African horticulture, Euphorbia trigona is sometimes planted as a living fence or protective barrier around homesteads • The toxic latex has been used in some African traditional medicine practices as a fish poison and purgative, though such uses are extremely dangerous and not recommended
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