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Valley Bush Euphorbia
Euphorbia grandidens
SA tree no: 350
English: Valley Bush Euphorbia, Valley-bush Euphorbia, Large-toothed Euphorbia, Big-tooth Euphorbia, Lowveld Euphorbia, Forest Euphorbia, Small Kafir-boom
Afrikaans: Valleibosnaboom, Groottandnaboom, Laeveld-naboom, Bosnaboom
Xhosa: umHlontlo
Zulu: umHlonhlo weHlathi, isiPhapha
Historical scientific names: Euphorbia grandidens var. grandidens, Euphorbia grandidens var. minor, Euphorbia evansii, Euphorbia arborescens, Euphorbia magnidens
Misapplied scientific names: Euphorbia triangularis, Euphorbia ingens.
Euphorbia grandidens, commonly known as the Valley Bush Euphorbia, Forest Euphorbia or Large-tooth Euphorbia, is a striking and distinctive succulent tree native to Southern Africa. It is characterised by its tall, upright, and branching growth habit, with distinctly angled stems and prominent, tooth-like projections along its ridges. This tree-like succulent is a notable feature of forested areas and rocky slopes, adding a unique architectural element to the landscape.
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Distinguishing features:
Tall, tree-like succulent with an upright, branching growth habit.
Stems are typically 4- to 5-angled (sometimes 3-angled), with prominent, wavy, and often wing-like ridges.
Paired, sharp, dark brown to black spines (up to 6 mm long) are arranged along the stem ridges.
Small, inconspicuous, greenish-yellow flowers (cyathia) are borne in clusters along the stem ridges.
Exudes a milky white, highly toxic latex (sap) when cut or damaged.
Small, ephemeral (short-lived) leaves that appear briefly on new growth.
Overall appearance:
Euphorbia grandidens is a large, succulent tree with an upright and branching growth form. It typically has a single, stout main stem that divides into numerous ascending branches, creating a somewhat candelabra-like appearance, though less distinctly so than Euphorbia triangularis. It can form dense stands in suitable habitats.
Height:
This succulent tree typically grows to a height of 5 to 15 metres, but can reach up to 20 metres under ideal conditions.
Width:
It forms a spreading crown, typically reaching a width of 5 to 10 metres.
Leaves:
The leaves are very small, inconspicuous, and ephemeral (short-lived). They are typically green and appear briefly on new growth or at the growing tips of the stems, quickly falling off.
Flowers:
The actual flowers are very small and inconspicuous, greenish-yellow, and are technically called "cyathia" (a modified inflorescence typical of the Euphorbia genus). They are borne in clusters along the ridges of the stems.
Flowering season:
Euphorbia grandidens typically flowers from late autumn to winter, specifically from May to July. In Kenton-on-Sea, Eastern Cape (current month June), it is currently in its flowering season.
Fruits:
The fruits are small, three-lobed (tricoccous) capsules, characteristic of the Euphorbia genus. They are green when young and turn reddish or brownish when ripe. When mature, they split open explosively to release their seeds.
Seeds:
The fruits contain small, rounded seeds.
Bark:
On old, mature specimens, the main trunk can develop a rough, greyish-brown bark. However, the majority of the plant's structure consists of green, succulent stems.
Stems:
The stems are the most defining feature. They are succulent, thick, and typically 4- to 5-angled (sometimes 3-angled), with prominent, wavy, and often wing-like ridges. Sharp, paired spines are arranged along these ridges.
Wood:
While it is a tree-like succulent, it does not produce hard wood in the traditional timber sense. Its stems are fleshy and succulent, but firm.
Thorns:
Prominent, sharp, rigid, paired spines up to 6 mm long are arranged along the ridges of the stems.
Roots:
It develops a fibrous root system that is adapted to anchoring the large plant and efficiently absorbing moisture.
Soil type:
Requires well-drained, sandy, or rocky soils. It is highly tolerant of poor, infertile soils and is intolerant of waterlogged conditions, which can lead to root rot.
Aspect:
Thrives in full sun, requiring ample sunlight for optimal growth. It is highly drought-tolerant and adapted to arid conditions. It is frost tender and cannot withstand severe frost, preferring warm, frost-free climates.
Edibility:
Euphorbia grandidens is not edible.
Toxicity:
Highly toxic. All parts of Euphorbia grandidens contain a caustic, milky white latex (sap) that is severely irritating. Contact with skin can cause rashes, blisters, and inflammation. If it gets into the eyes, it can cause severe pain, temporary blindness, and permanent damage. Ingestion can lead to severe gastrointestinal irritation, vomiting, diarrhoea, and internal inflammation. Extreme caution should be exercised when handling this plant; wear gloves and eye protection.
Uses:
Ornamental: Cultivated in arid gardens, succulent collections, and as a dramatic architectural specimen plant.
Barrier/Hedge: Due to its formidable spines, it can be planted to create an effective living barrier or security hedge.
Traditional Medicine: The latex has been used in traditional medicine, but only with extreme caution due to its toxicity.
Soil Stabilisation: Can be used in rocky or sandy areas to help stabilise soil and prevent erosion.
Ecology:
Euphorbia grandidens provides important habitat and shelter for various animals in its arid and semi-arid environments. Birds often nest within its spiny branches, finding protection from predators. Its flowers (cyathia) attract small pollinating insects. Browsing animals generally avoid consuming the plant due to its toxic latex.
Distribution and habitat:
Euphorbia grandidens is native and endemic to Southern Africa. It is found predominantly in the Eastern Cape and KwaZulu-Natal provinces of South Africa. It typically grows on rocky slopes, in bushveld, and along forest margins.
Derivation of name:
Euphorbia: The genus name honours Euphorbus, the Greek physician to King Juba II of Mauretania, who discovered its medicinal properties.
grandidens: The specific epithet is derived from Latin, meaning "large-toothed," referring to the prominent, tooth-like projections along the ridges of the stems.
Historical aspects:
Euphorbia grandidens has long been a prominent feature of the South African landscape, particularly in the Eastern Cape and KwaZulu-Natal. Its striking form has made it recognizable. Its latex has been used in some traditional practices with extreme caution, often for very specific purposes. Its unique appearance has also led to its cultivation globally as an ornamental plant.
Interesting facts:
The name grandidens means "large-toothed," referring to the prominent, tooth-like projections along its stem ridges.
Like other Euphorbia species, it contains a milky white latex (sap) that is highly toxic and can cause severe skin irritation and even blindness if it gets in your eyes.
It can grow to be a very large and impressive succulent tree, reaching heights of up to 20 metres.
Its unique, angled stems and sharp spines make it a very distinctive plant in its natural habitat.
Despite its toxicity, it provides important shelter and nesting sites for birds.
Growing tips:
Light: Requires full sun to thrive. Plant in a location that receives ample direct sunlight daily.
Soil: Essential to use very well-drained soil. A sandy, gritty, or rocky soil mix is ideal. It cannot tolerate waterlogged conditions.
Watering: Extremely drought-tolerant. Water sparingly, especially during winter (its dormant period). Allow the soil to dry out completely between waterings. Overwatering is the biggest killer.
Frost Protection: It is frost tender. Plant in a frost-free area or provide protection in colder climates. Young plants are particularly vulnerable.
Propagation: Easily propagated from stem cuttings. Allow cuttings to dry and form a callus for several days before planting in well-drained soil. Wear gloves and eye protection when taking cuttings due to the toxic latex.
Maintenance: Very low-maintenance once established. Requires minimal feeding.
Safety: Always handle with extreme caution due to the toxic latex and sharp spines. Wear protective gloves and eyewear.
This plant is a fantastic alternative for:
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