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Pincushion Euphorbia
Euphorbia pulvinata
SA tree number
English: Pincushion Euphorbia, Prickly Heaps, Pincushion Cactus, Prickly-leaved Cushion Euphorbia, Cushion Euphorbia
Afrikaans: Voetangel
Xhosa: Inkamamasane, Isihlehle
Euphorbia pulvinata, commonly known as the Pincushion Euphorbia or Prickly Heaps, is a distinctive indigenous succulent native to Southern Africa. It is highly valued for its unique growth form, creating dense, cushion-like mounds composed of numerous tightly packed, spiny stems. While its flowers are small and yellow-green, its architectural shape and intriguing texture make it a popular choice for rockeries, succulent gardens, and containers. Like many Euphorbias, it produces a milky, irritating latex.
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Distinguishing features
A low-growing, clumping succulent forming dense, rounded cushions or mounds (pulvini).
Stems are short, thick, succulent, and covered in prominent tubercles (small wart-like bumps).
Each tubercle typically bears a single, sharp spine.
Produces small, yellow-green flowers (cyathia) at the tips of the stems, often in spring to early summer.
Contains a milky white, irritating latex when damaged.
Overall appearance:
Euphorbia pulvinata forms a striking, compact, and textured groundcover or mounding plant. Its overall appearance is that of a dense "pincushion" or a collection of small, spiny, green mounds, which can grow to impressive sizes in natural habitats.
Height:
Typically grows 10–50 cm tall, forming a low, dense mound. In natural settings, some cushions can reach up to 1.5 metres in height.
Width:
Forms spreading clumps, often 30–60 cm in diameter, but can expand to over 1.5 metres across over time, with many individual heads merging into a single large cushion.
Leaves:
Leaves are tiny, rudimentary, and ephemeral (short-lived), appearing only briefly on new growth and quickly falling off.
Photosynthesis is primarily carried out by the green succulent stems.
Flowers:
Small, inconspicuous, yellow-green, bell-shaped structures called cyathia (the specialised inflorescence of Euphorbia).
Borne solitarily or in small clusters at the tips of the stems.
The actual flowers are minute within the cyathia.
Euphorbia pulvinata is dioecious, meaning male and female flowers are borne on separate plants.
Flowering season:
Mainly flowers in spring to early summer, typically from September to January, but can flower sporadically at other times depending on conditions.
Fruits:
Small, three-lobed, dehiscent capsules, characteristic of Euphorbia species.
They ripen to a brownish colour and split open explosively to disperse seeds.
Seeds:
Small, round, and smooth, dispersed from the fruit when ripe.
Stems:
Short, thick, cylindrical to globose, succulent stems. They are typically grey-green and covered in numerous prominent tubercles arranged in spiral rows. These stems branch enthusiastically, forming dense clumps. Older, larger stems at the base of the cushion may develop a slightly corky or hardened surface.
Thorns:
Yes, it possesses spines. Each tubercle typically bears a single, sharp, stiff spine (modified stipule), varying in colour from whitish to purplish, adding to its "pincushion" appearance.
Roots:
Possesses a fibrous root system. When grown from cuttings, new roots readily form.
Soil type:
Requires very well-drained, sandy, or gritty soil. It is tolerant of poor and rocky soils, reflecting its natural habitat. Excellent drainage is crucial to prevent rot.
Aspect:
Thrives in full sun to light shade. It is highly drought-tolerant and relatively cold-tolerant for a succulent, able to withstand light to moderate frost once established, especially if kept dry in winter.
Edibility:
Not edible.
Toxicity:
Like most Euphorbia species, Euphorbia pulvinata produces a copious, milky white latex (sap) when damaged. This latex is toxic and highly irritating.
Skin Contact: Can cause severe skin irritation, dermatitis, and blistering.
Eye Contact: Extremely dangerous, potentially causing severe pain, temporary blindness, and permanent eye damage if it comes into contact with the eyes. Always wear eye protection when handling or pruning.
Ingestion: Poisonous, causing severe gastrointestinal upset, burning sensations, vomiting, and diarrhoea.
Safety: Handle with extreme caution. Wear gloves and eye protection. Wash hands thoroughly after any contact. Keep away from children and pets.
Uses:
Ornamental Plant: Highly valued in succulent and rock gardens for its unique, cushion-forming habit and spiny texture. Excellent for containers, window sills, and xeriscaping.
Groundcover: Can be used as an unusual, low-maintenance groundcover in arid or semi-arid gardens, creating a natural, spiny mat.
Security Barrier: Its dense, spiny growth can act as an effective deterrent when planted in strategic locations.
Traditional Uses: Roots and latex have been used traditionally in some areas for purposes such as bird lime (a sticky substance to catch birds) and some medicinal applications, but due to its toxicity, these uses are highly risky and not recommended. It has also been reported as poisonous to livestock.
Ecology:
Drought Adaptation: Its succulent stems are highly adapted to storing water, allowing it to survive prolonged dry periods.
Defense: The spines and toxic latex provide effective defense against herbivores.
Habitat: Provides dense, low-growing cover in its natural environment.
Distribution and habitat:
Euphorbia pulvinata is widely distributed in Southern Africa.
South African Provinces: Eastern Cape, Free State, KwaZulu-Natal, Limpopo, Mpumalanga, Northern Cape (specifically mentioned in Karoo and extending into grasslands). Lesotho and Eswatini (Swaziland) are also part of its range.
Habitat: Found in a variety of arid and semi-arid habitats, including rocky slopes, grasslands, and Karoo veld, often forming dense colonies on exposed, well-drained sites. It typically occurs at altitudes ranging from 700 m to 1830 m above sea level.
Derivation of name:
The genus name Euphorbia honours Euphorbus, the Greek physician to King Juba II of Numidia, who reportedly used a Euphorbia species for medicinal purposes.
The species epithet pulvinata is Latin for "cushion-like" or "forming a cushion," directly referring to its characteristic dense, mounding growth habit.
Common names like "Pincushion Euphorbia" or "Prickly Heaps" are descriptive of its spiny, cushion-like appearance.
Historical aspects:
Euphorbia pulvinata has been recognised for its unique form and traditional uses by indigenous peoples for centuries. Its resilience and striking appearance have made it a popular plant among succulent collectors and gardeners globally, leading to its widespread cultivation.
Interesting facts
This Euphorbia is a master of disguise, looking very much like a cactus with its spines and succulent body, but it's actually from a completely different plant family!
Its name, "pulvinata," is Latin for "cushioned," perfectly describing the way it grows in dense, spiny mounds that resemble green pincushions.
Even though it looks tough, handle with care! Breaking a stem releases a milky white sap that's highly irritating – definitely not for touching!
Growing tips
Propagation: Easily propagated from stem cuttings. Allow cuttings to dry and form a callus for several days to a week before planting in well-drained, sandy, or gritty soil to prevent rot.
Planting: Requires full sun to light shade. Ensure excellent drainage; it is very susceptible to root rot in waterlogged conditions. Ideal for rockeries, succulent beds, or containers.
Watering: Extremely drought-tolerant. Water sparingly, allowing the soil to dry out completely between waterings. Reduce watering significantly or stop altogether during its dormant cooler months, especially if growing in an area with winter rainfall or heavy frost.
Frost: Relatively cold-hardy for a succulent, but should be protected from severe or prolonged frost, especially when young or if conditions are wet. Established plants can tolerate light frost.
Maintenance: Low maintenance. Avoid over-fertilising. Pruning is rarely needed but if required, use extreme caution due to the toxic latex.
Safety: Crucially, be aware of its highly irritating and toxic milky latex. Always wear protective gloves and eye protection when handling or pruning. Keep out of reach of children and pets.
This plant is a fantastic alternative for:
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