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Krantz Aloe
Aloe arborescens
SA tree no: 28.1
English: Krantz Aloe, Torch Aloe, Common Aloe, Tree Aloe, Many-stalked Aloe
Afrikaans: Kransaalwyn, Kandelaar-aalwyn, Boomaalwyn, Gewone Aalwyn
Xhosa: ikalene
Zulu: inkalane, umhlabana
S. Sotho: Lekhalana
Historical scientific names: Aloe arborea, Aloe fruticosa, Aloe mutabilis, Aloe perfoliata var. arborescens, Aloe natalensis
Aloe arborescens, commonly known as the Krantz Aloe or Candelabra Aloe, is one of South Africa's most recognisable and widespread indigenous aloes. This large, multi-stemmed, shrubby to tree-like succulent is famous for its dense rosettes of blue-green leaves and its spectacular winter display of bright orange-red (sometimes yellow) flower spikes, often forming a candelabra shape.
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Distinguishing features:
Multi-stemmed, branching shrub or small tree, often forming dense clumps.
Rosettes of blue-green to green, relatively narrow, recurved leaves.
Leaf margins have prominent, pale teeth.
Produces tall, unbranched flower spikes in dense, often candelabra-like clusters.
Flowers are typically bright orange-red (occasionally yellow).
Flowers predominantly in winter.
Overall appearance:
Aloe arborescens is a robust, sprawling, and highly branched succulent that can form large, dense shrubs or small, multi-stemmed trees. Its numerous stems are topped with rosettes of arching leaves, and in winter, it transforms into a fiery display with numerous upright flower spikes, resembling a candelabra.
Height:
Typically grows 2 to 4 metres tall, but can sometimes reach up to 5 metres, especially in sheltered conditions or when mature.
Width:
Can spread significantly, forming dense clumps 2 to 4 metres wide.
Leaves:
The leaves are long, relatively narrow (compared to some other tree aloes), fleshy, and recurved or arching, forming dense rosettes at the ends of the branches. They are typically 50-80 cm long and 5-8 cm wide at the base. The colour is blue-green to green, often with a reddish tinge in full sun or cold. The margins are edged with numerous, prominent, pale (often whitish) teeth (spines), about 2-4 mm long and spaced 1-2 cm apart.
Flowers:
The flowers are tubular, about 2.5-4 cm long, and densely packed onto tall, erect, unbranched spikes (racemes). Each inflorescence typically has multiple racemes (5 to 10 or more) arising from a single branched flower stalk, forming a distinctive candelabra-like shape. The flowers are typically a vibrant orange-red to scarlet, sometimes with a yellowish tip, but yellow-flowered forms also occur. The stamens are exerted (protrude beyond the petals). Aloe arborescens flowers are hermaphroditic, containing both male and female reproductive parts, so it is not dioecious.
Flowering season:
In South Africa, it is primarily a winter-flowering aloe, blooming from late autumn through winter (around May to August), with its peak display often in June and July.
Fruits:
The fruit is a dry capsule that develops after the flowers are fertilised. It is typically oblong, 2-3 cm long, and splits into three valves when mature to release the seeds.
Seeds:
The seeds are small, flattened, and winged, typically 2-3 mm long, with a dark brown to black colour. The wings aid in wind dispersal.
Stems:
The fleshy, fibrous stems are sturdy and covered with persistent, dry, old leaf bases, which give them a textured, brownish-grey appearance. As the stems age and branch, they can become quite woody and robust.
Thorns:
The leaf margins are armed with numerous, sharp, pale teeth or spines.
Roots:
It has a fibrous root system that helps it anchor and absorb moisture, especially in rocky or well-drained soils. It can also produce adventitious roots from prostrate stems.
Soil type:
Highly adaptable and thrives in a wide range of well-drained soils, including sandy, loamy, and rocky soils. It is particularly well-suited to dry, arid, or semi-arid conditions but can also grow in areas with moderate rainfall, provided drainage is good.
Aspect:
Prefers full sun for best flowering and compact growth, but can tolerate partial shade. It is highly drought-tolerant and can withstand heat and dry conditions. It is one of the most frost-tolerant tree aloes, with mature plants capable of withstanding moderate frost, though leaves may get damaged.
Edibility:
Not typically considered edible. While some aloe species have medicinal uses, Aloe arborescens is not commonly consumed as food. The sap is very bitter.
Toxicity:
Like many aloes, the sap contains anthraquinones, which can be purgative and irritating if ingested. The leaves are bitter and unpalatable. While not acutely toxic in small amounts, large ingestion can cause gastrointestinal upset. The spines on the leaves can cause physical injury.
Uses:
Extensively cultivated as an ornamental plant in gardens, parks, and public spaces worldwide due to its spectacular winter flower display, architectural form, and hardiness. It is excellent for xeriscaping (water-wise gardening), mass planting on slopes, rockeries, and as a barrier plant. Its cut flower spikes are used in floral arrangements. In traditional South African medicine, Aloe arborescens is widely used. The bitter leaf sap is used internally as a purgative and for various digestive complaints, and externally for skin irritations, burns, wounds, and infections. It is also used in remedies for colds, flu, and coughs.
Ecology:
The vibrant red and orange flowers of Aloe arborescens are a crucial food source for various pollinators and nectarivores, particularly during winter when few other plants are flowering. These include sunbirds (which are strongly attracted to its nectar), bees, and other insects. The dense, clumping growth provides excellent nesting and roosting sites for various bird species, especially small passerines. It also offers shelter for small ground-dwelling animals.
Distribution and habitat:
Aloe arborescens is indigenous and widespread across a large part of South Africa, including the Western Cape, Eastern Cape, KwaZulu-Natal, Mpumalanga, Limpopo, Gauteng, and Free State provinces, extending into other southern African countries like Lesotho, Eswatini, and Mozambique. It is highly adaptable and grows in a variety of habitats, including rocky outcrops, mountain slopes, coastal bush, forest margins, and open grasslands, often forming dense colonies on cliff faces or hillsides (hence "Krantz Aloe" - 'krantz' meaning cliff).
Derivation of name:
The genus name Aloe is derived from the Arabic word "alloeh" or Hebrew "allal," meaning "bitter," referring to the bitter sap found in the leaves of many aloe species.
The species name arborescens is Latin for "tree-like" or "becoming a tree," referring to its large, branched, tree-like growth habit.
Common names like "Krantz Aloe" refer to its common habitat on rocky cliffs ("krantzes"). "Candelabra Aloe" describes the distinctive branching pattern of its flower spikes.
Historical aspects:
Aloe arborescens has a long and significant history of traditional use by indigenous communities in Southern Africa for a wide range of medicinal purposes, cementing its place as a powerful traditional remedy. It was also one of the earliest South African aloes to be introduced to Europe (as early as the 17th century) and quickly gained popularity as an ornamental plant. Its hardiness, adaptability, and spectacular winter flowering display have made it a ubiquitous and beloved garden plant globally, and numerous cultivars have been developed. Its widespread natural distribution also highlights its ecological resilience.
Interesting facts:
This aloe is the ultimate winter warrior! When most other plants are dormant, the Krantz Aloe bursts into a fiery display of orange-red flowers, providing a vital food source for sunbirds.
It gets its "Candelabra Aloe" name because its flower stalks branch out like a fancy candelabra, holding up dozens of bright blooms.
You'll often find it growing happily on rocky cliffsides or "krantzes" (hence "Krantz Aloe"), clinging on where few other plants dare to grow. It's incredibly tough!
This plant is not just pretty; it's also a powerhouse in traditional medicine, used for everything from burns to colds. But remember, always consult experts before trying any plant for medicinal purposes!
Growing tips:
Propagation: Very easy to propagate from cuttings. Simply break off a side branch, allow it to dry for a few days to a week (to form a callus), and then plant it in well-drained soil. Can also be grown from seed.
Planting: Requires well-drained soil. If planting in clay soil, amend heavily with sand and compost to improve drainage. Prefers full sun for best flowering.
Watering: Water deeply but infrequently. Allow the soil to dry out completely between waterings. Very drought-tolerant once established.
Frost Protection: While relatively frost-tolerant, protect young plants from severe frost. Mature plants can withstand moderate frost, though some leaf damage may occur.
Feeding: Feed sparingly with a balanced, slow-release fertiliser during its active growing season (autumn/winter). Over-fertilising can lead to soft, unhealthy growth.
Pruning: Can be pruned to shape or to remove old, woody stems, which encourages bushier growth. Remove spent flower stalks.
This plant is a fantastic alternative for:
Common name
Scientific Name
Plant type:
Plant type
Plant family:
Asphodelaceae (like Asphodelus) - Order: Asparagales