Aloe macracantha Baker
Long-spined aloe
Aloe macracantha is a widely distributed aloe in northeastern Africa, present in Ethiopia, Somalia, and Kenya. It is distinguished by the exceptionally long and robust marginal teeth of its leaves, giving it a very spiny appearance. It grows in dry scrublands, grasslands, and rocky slopes. Its flowers are red to orange.
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Overview
| Category | Classification |
|---|---|
| Family | Asphodelaceae |
| Genus | Aloe |
| Growth Habit | Solitary or slightly clustering rosette |
| Conservation Status | Least concern; wide distribution in the Horn of Africa. |
| pH Target | 6.5–8.5 |
| Type | Sandy-gravelly, extremely well drained. |
Origin & Habitat
Morphology
Lance-shaped grayish-green to blue-green leaves with very long, spiny, whitish to brown marginal teeth. Surface with variable pale spots.
ecoShort or stemless; some forms develop an erect stem up to 30 cm.
ecoRed to orange tubular flowers in simple or branched erect racemes. Blooms in austral winter to spring.
ecoExtensive fibrous root system, adapted to dry and stony soils of northeastern Africa.
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Requirements
Soil & Substrate
Type
Sandy-gravelly, extremely well drained.
groups Beneficial Associations
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Propagation Strategy
- 1 Sow in coarse sand with minimal organic matter.
- 2 Keep at 24–30 °C with very occasional watering.
- 3 Full sun from germination.
- 4 Transplant when seedling has 4–5 leaves.
Its long spines require handling with thick gloves.
Overwatering; rots quickly.
Every 3–4 years.
No fertilization or very minimal once a year.
Uses & Applications
Precautions / Toxicity
Moderately toxic if ingested; spines cause physical injury.
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"Its marginal teeth are among the longest in the genus; likely an adaptation to intense herbivory in arid habitats of the Horn of 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.