Aloe melanacantha A.Berger
Black-thorn aloe
Compact aloe from Namaqualand known for its very dark, almost black marginal spines that dramatically contrast with the green leaf colour. Grows in poor, rocky soils of the arid Northern Cape plains.
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Overview
| Category | Classification |
|---|---|
| Family | Asphodelaceae |
| Genus | Aloe |
| Growth Habit | Compact rosette, stemless |
| Conservation Status | Least Concern (LC) — IUCN |
| pH Target | 6.5–8.0 |
| Type | Sandy-gravelly, extremely well-drained |
Origin & Habitat
Morphology
Lanceolate, green leaves with very dark, almost black marginal spines, which give it its common name. Slightly rough surface.
ecoGenerally stemless or with a very short stem; can produce clustered rosettes over time.
ecoTubular orange-red flowers in simple racemes. Flowering in winter-spring.
ecoFibrous root system adapted to arid rocky soils with scarce organic matter.
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Requirements
Soil & Substrate
Type
Sandy-gravelly, extremely well-drained
groups Beneficial Associations
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Propagation Strategy
- 1 Carefully separate basal offsets.
- 2 Allow the cut to dry for 2–3 days.
- 3 Plant in dry sandy substrate.
- 4 Water minimally until new roots appear.
Requires the best possible drainage; sensitive to waterlogging.
Overwatering, especially in winter.
Every 3–5 years or when the plant outgrows the pot.
No fertiliser or very little once a year in spring.
Uses & Applications
Precautions / Toxicity
Mildly toxic to pets.
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"The black spines are a visually unique adaptation within the Aloe genus; highly valued by desert succulent collectors."
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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.