Pleiospilos nelii Schwantes
Split Rock / Living Granite
Pleiospilos nelii is a succulent in the Aizoaceae family native to the central and eastern Karoo of South Africa. It grows as rounded, paired leaf bodies that perfectly mimic granite rocks in its environment, a key adaptation that reduces herbivory. It is one of the most widely cultivated "living stones" in global succulent collections.
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Pleiospilos |
| Growth Habit | Very slow-growing perennial succulent, acaulescent (no visible stem), bearing 1–2 leaf pairs per adult plant. |
| Conservation Status | Least Concern (LC) on the IUCN Red List; wild populations under pressure from illegal collection and habitat loss. |
| pH Target | 6.0 – 7.0 |
| Type | Stony, mineral Karoo soil with almost no organic matter; substrate of quartz, shale, and decomposed granite with excellent drainage. |
Origin & Habitat
Morphology
Leaves are extremely succulent, arranged in opposite pairs and fused at the base, with a granular surface in grey-green or brownish-pink tones mimicking granite. Each leaf measures 4–6 cm wide and contains abundant water-storing parenchyma to survive extended droughts.
ecoThe stem is virtually absent or very short and largely subterranean; the entire visible plant consists of the fused leaf pair at or just above ground level. The stem base can produce new leaf pairs over the years.
ecoFlowers are large, 6–8 cm in diameter, with numerous petals in deep orange, salmon, or golden-yellow hues; they emerge from the central fissure between the leaves. Flowering typically occurs in autumn–winter and opens during peak sunlight hours.
ecoDeep, fleshy root system adapted to anchor the plant in stony substrates and rapidly absorb infrequent rainfall. Roots extend vertically more than laterally to access deep soil moisture.
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Requirements
Soil & Substrate
Type
Stony, mineral Karoo soil with almost no organic matter; substrate of quartz, shale, and decomposed granite with excellent drainage.
groups Beneficial Associations
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Propagation Strategy
- 1 Sow on the surface of very fine, sandy mineral substrate that is lightly moist, without covering the seeds.
- 2 Maintain temperature of 18–25 °C with day/night fluctuation (5–8 °C difference); this is key for germination.
- 3 Cover with clear glass or plastic to retain humidity; open daily to ventilate and prevent fungal issues.
- 4 Seedlings emerge in 2–4 weeks; gradually remove the cover when plantlets reach 5 mm.
- 5 Seedlings grow very slowly; transplant individually when manageable, at 6–12 months.
- 1 Divide only when the plant has 3 or more well-formed heads; do so at the start of autumn when active growth begins.
- 2 Carefully remove the plant from its pot and clear substrate from the roots.
- 3 With a sterilized knife, make clean cuts separating each head with its roots; avoid damaging the thick roots.
- 4 Allow cut surfaces to callus for 1–2 days in an airy spot before replanting.
- 5 Replant each division in very well-draining mineral substrate; do not water for one week.
Water only during active growth (autumn-winter); never water while old leaves are being absorbed by new ones — the plant draws water from its internal reserves.
Watering in summer during semi-dormancy, which quickly rots the roots and kills the plant.
Every 3–4 years, only when roots are completely pot-bound. Do so at the start of autumn. Use shallow terracotta pots.
No fertilization, or very occasional (once per growing season) with heavily diluted cactus fertilizer. Excess nitrogen distorts growth.
Uses & Applications
Precautions / Toxicity
No significant toxicity reported for humans; may cause mild gastrointestinal discomfort if ingested in large quantities. Considered low toxicity for pets, though keeping it out of reach is advised.
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"P. nelii is notably bimorphic: the cultivated "Royal Flush" variety displays very intense purple-pink tones selected horticulturally. In wild conditions the plant can spend decades with a single active leaf pair without producing any divisions."
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Scientific Integrity
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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.