Aloe microstigma Salm-Dyck
Karoo Aloe / Small-Spotted Aloe
Karoo Aloe is a medium-sized species native to the arid plains and rocky slopes of the South African Karoo and Namaqualand. Its grey-green leaves display characteristic white spots and reddish marginal spines; under stress it develops an overall purplish-pink flush that makes it highly ornamental.
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© Krzysztof Ziarnek, Kenraiz
CC BY-SA 4.0
Overview
| Category | Classification |
|---|---|
| Family | Asphodelaceae |
| Genus | Aloe |
| Growth Habit | Acaulescent to subcaulescent; solitary or in small groups; rarely branched. |
| Conservation Status | Least Concern (IUCN). Well-adapted to the extreme conditions of the semi-arid Karoo. CITES Appendix II. |
| pH Target | 6.5 – 8.0 |
| Type | Very poor, sandy-rocky soil, neutral to slightly alkaline pH. |
Origin & Habitat
Morphology
Lanceolate leaves 30–50 cm, grey-green with irregular white spots; brown-red marginal spines. Under water or cold stress the entire leaf takes on a highly decorative purple tone.
ecoShort stem under 20 cm, erect or slightly decumbent. In a pot it may develop a short pseudo-trunk with persistent dead leaves.
ecoSimple or forked inflorescence 50–80 cm; racemes of tubular pink-red to orange-red flowers, paler at the tip. Blooms in winter (June–August Southern Hemisphere).
ecoFibrous shallow root system, well-adapted to hard compacted Karoo substrates.
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Requirements
Soil & Substrate
Type
Very poor, sandy-rocky soil, neutral to slightly alkaline pH.
groups Beneficial Associations
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Propagation Strategy
- 1 A. microstigma produces offsets in dense clusters; separate when they are 8–10 cm tall with well-developed roots
- 2 Remove with a disinfected knife cutting cleanly at the base; carefully clean soil from the roots
- 3 Allow to callous in a dry, ventilated spot for 2–3 days before planting
- 4 Plant in well-drained mineral substrate; first watering after 10–14 days to encourage rooting in the new container
- 1 Sow fresh seeds on coarse sand + perlite; do not cover with substrate
- 2 Keep at 20–26 °C under a transparent cover with bright indirect light
- 3 Germinate in 2–4 weeks; gradually ventilate from the second week
- 4 Transplant when seedlings reach 3–4 cm in height
The dense clusters of A. microstigma create a striking visual effect; it can be grown intentionally in groups
Not separating offsets when the colony exceeds the pot's capacity
Every 2–3 years in spring or when the offset colony overflows the pot.
Balanced succulent fertilizer at 50% dose, once in spring and once in summer.
Uses & Applications
Precautions / Toxicity
Mild toxicity (latex, aloin) for pets. CITES Appendix II.
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"A. microstigma endures some of the most extreme water regimes in the genus: in its native central Karoo habitat it can go up to 10 months without significant rainfall. The purple flush under stress reflects betacyanin and anthocyanin synthesis as a photoprotection mechanism, studied as a model in CAM-plant stress physiology research."
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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.