Aloidendron barberae (Dyer) Klopper & Gideon F.Sm.
Giant tree aloe
Aloidendron barberae is the world's largest tree aloe, capable of reaching 18 meters in height and over one meter in trunk diameter. Originally described as Aloe barberae by William Turner Thiselton-Dyer, in honor of Mrs. Barber and her brother Thomas Holden Bowker, who sent material of the species to Kew. Reclassified to the genus Aloidendron by Klopper and Gideon F. Smith in 2013, this majestic tree-aloe forms groves in moist ravines of KwaZulu-Natal, Mozambique and Swaziland, and is one of the most imposing plants on the African continent. It can live for several centuries and is considered a heritage tree in many communities of its range.
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© Dr. Alexey Yakovlev, Wikimedia Commons
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Overview
| Category | Classification |
|---|---|
| Family | Asphodelaceae |
| Genus | Aloidendron |
| Growth Habit | Thick-trunked succulent tree with dichotomous or irregular branching; dense crown of terminal rosettes. Slow growing: 30–50 cm per year under favorable conditions. |
| Conservation Status | Near Threatened (NT) – IUCN; populations declining due to habitat loss |
| pH Target | 6,0 – 7,5 |
| Type | Deep, clay-loam soil with good deep drainage. Tolerates rocky coastal soils. |
Origin & Habitat
Morphology
Lanceolate leaves 60–90 cm, glaucous-green to blue-green, with reddish-brown toothed margins. Grouped in dense terminal rosettes at branch tips. Surface with slight waxy coating.
ecoWoody trunk, thick (up to 1 m in diameter in old specimens), grey-brown with well-marked leaf scars. Branches dichotomously above a certain height, forming a dense, spherical crown.
ecoTubular flowers 4–5 cm, pinkish-red to pale coral, arranged in large conical, erect racemes on branched scapes up to 1.5 m tall. Flowering in the austral winter (June–August), extraordinarily showy.
ecoDeep and extensive root system anchoring the tree in the clay and stony soils of coastal ravines. Roots can extend several times the canopy diameter.
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Requirements
Soil & Substrate
Type
Deep, clay-loam soil with good deep drainage. Tolerates rocky coastal soils.
groups Beneficial Associations
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Propagation Strategy
- 1 Sow fresh seeds in equal parts coarse sand, perlite and mineral substrate.
- 2 Keep at 25–30 °C with diffuse light and consistent moisture.
- 3 Seedlings grow very slowly; transplant when 8–10 cm tall.
- 4 Grow in pots for the first 5–8 years before planting in permanent ground.
- 1 Cut a young branch 30–50 cm with an active rosette.
- 2 Allow the cut end to dry for 1 week in a shaded, well-ventilated spot.
- 3 Plant in sandy-loam substrate and water sparingly until signs of active growth appear.
T
Overwatering young specimens.
In pots: every 3–4 years while young; every 5–7 years at maturity.
Once a year in spring with slow-release tree fertilizer (NPK 10-5-10). Adult specimens in the ground do not require fertilization.
Uses & Applications
Precautions / Toxicity
Latex can be irritating to sensitive skin. Internal consumption of roots in large quantities can be toxic. Do not consume without specialized medical supervision.
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Plant Health
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"Aloidendron barberae is the slowest-growing of the arborescent aloes: reaching 5 m can take 20–30 years. However, with 100–200 years it can exceed 18 m with a trunk over 1 m wide. It is a protected species in South Africa. The genus Aloidendron was segregated from Aloe in 2013 and includes all large arborescent aloe species (A. dichotoma, A. pillansii, A. tongaense, A. eminens, A. ramosissimum and A. barberae). Its winter flowering is one of the most impressive botanical spectacles in southern Africa."
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Scientific Integrity
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Sources
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Discussion
Disclaimer
This species record is provided for educational and informational purposes only. Jardín Roca Negra does not guarantee the accuracy or completeness of the data. Content is community-curated and may be subject to revision; it should not replace advice from a qualified botanist. This species may be toxic, invasive, or subject to legal restrictions — verify before handling or cultivating. Jardín Roca Negra accepts no liability for any harm arising from reliance on this information. Images are reproduced under Creative Commons or equivalent free licenses; credits are noted below each image.