Aloe descoingsii Reynolds
World's smallest aloe
Aloe descoingsii is recognised worldwide as the smallest aloe in the world, forming rosettes of just 2–3 cm in diameter on the limestone of the spiny bush of Toliara, southern Madagascar. It is a highly sought-after collector's gem for its extraordinarily small size and delicate miniature orange flowers that emerge in inverse proportion to the plant. Its name honours the French botanist Bernard Descoings.
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Overview
| Category | Classification |
|---|---|
| Family | Asphodelaceae |
| Genus | Aloe |
| Growth Habit | Miniature rosette, solitary or in small dense clusters |
| Conservation Status | Vulnerable |
| pH Target | 7.5–8.5 |
| Type | Pure crushed limestone, alkaline calcareous lithosol |
Origin & Habitat
Morphology
Ovate-lanceolate leaves 1.5–3 cm long, dark green with white spots on both surfaces, tiny white marginal teeth 0.5 mm.
ecoVirtually stemless; the 2–3 cm diameter rosette grows flush with the limestone surface.
ecoMinute tubular flowers 0.8–1.2 cm long, orange, on slender peduncles 5–10 cm tall with 3–8 flowers per raceme.
ecoVery fine roots penetrating micro-fissures in limestone; adapted to near-absent substrate with alkaline pH.
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Requirements
Soil & Substrate
Type
Pure crushed limestone, alkaline calcareous lithosol
groups Beneficial Associations
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Propagation Strategy
- 1 Sow in very fine crushed limestone at 26–30 °C with high ambient humidity.
- 2 Use a very fine spray; never water directly over the seeds.
- 3 Erratic germination between 3 and 10 weeks; do not discard the seedling tray before 3 months.
- 4 Seedlings are extremely small; handle with fine tweezers and transplant at 6 months.
- 1 Separate mature clusters in spring with a sterile scalpel under a loupe.
- 2 Allow cuts to callus for 4–5 days in a very dry and warm environment.
- 3 Plant individually in pure limestone; do not water until new leaves appear.
- 4 Root in 6–10 weeks.
Use very small pots (3–5 cm diameter) to control substrate moisture.
Watering at normal frequency for other aloes, fatal for this ultra-dry miniature.
Every 4–6 years; almost never needed due to its minimal size
No fertilisation; poor substrate mimics its natural habitat
Uses & Applications
Precautions / Toxicity
Toxic if ingested, though its minimal size reduces the practical risk.
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"A. descoingsii is the extreme example of miniaturisation in the genus Aloe; its extreme morphological reduction in response to an ultra-xeric calcareous habitat makes it a study model for the evolutionary mechanisms of dwarfism in succulents, a field in active development in the evolutionary ecology of Malagasy spiny bush plants."
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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.