Cotyledon pendens van Jaarsv.
Cliff Cotyledon / Trailing Cliff Cotyledon
Cotyledon pendens, the Cliff Cotyledon, is unique within the genus for its decumbent and pendant habit, adapted to growing from the edges of doleritic cliffs in the northeastern Eastern Cape of South Africa (Transkei region). Its long pendant stems with leaves clustered at the tips give it an appearance radically different from the typical erect shrubs of the family.
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Overview
| Category | Classification |
|---|---|
| Family | Crassulaceae |
| Genus | Cotyledon |
| Growth Habit | Pendant succulent; elongated prostrate to pendant stems up to 1.5 m long; suited to hanging basket cultivation or growing over the edge of walls and rocks. |
| Conservation Status | Not assessed by IUCN; very restricted distribution in the Transkei (northeastern Eastern Cape); sensitive to loss of doleritic cliff ledges through erosion and human disturbance. |
| pH Target | 5.5 – 6.5 |
| Type | Doleritic-rocky, acidic to neutral, highly permeable and nutrient-poor. |
Origin & Habitat
Morphology
Obovate-cylindrical leaves 2–4 cm long, grey to blue-green with moderate farina; arranged in terminal clusters at the tips of pendant stems; entire margin; rounded apex with small tip.
ecoThin, succulent, elongated stems up to 150 cm long, with well-spaced internodes; occasional adventitious roots at nodes facilitating anchoring in rock crevices.
ecoPendant tubular flowers orange to intense red, 2–2.5 cm; inflorescences 20–30 cm produced at the pendant tips; spring to summer flowering.
ecoFibrous and shallow root system; adventitious roots at stem nodes; specialized for anchoring on vertical rock surfaces.
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Requirements
Soil & Substrate
Type
Doleritic-rocky, acidic to neutral, highly permeable and nutrient-poor.
groups Beneficial Associations
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Propagation Strategy
- 1 Wearing gloves, cut a pendulous stem segment 8–12 cm long including at least 2–3 pairs of cylindrical blue-grey leaves.
- 2 Remove the basal pair of leaves.
- 3 Allow the cut to dry upright (resting in a glass without touching the bottom) for 3–5 days so the callous forms well on the fleshy tissue.
- 4 Insert into cactus mix with high perlite content (40%); the species has delicate roots that need aeration.
- 5 Water very sparingly and place in bright indirect light or gentle full sun. Avoid disturbances for the first 5–6 weeks.
- 1 Wearing gloves, carefully detach a healthy cylindrical blue-grey leaf.
- 2 Allow to rest on dry paper for 4–6 days.
- 3 Lay horizontally on cactus mix with the base barely touching the surface.
- 4 Mist gently every 5–7 days; as a rare species, patience is key.
⚠️ TOXICITY: Cotyledon pendens contains bufadienolides and is toxic to humans and animals. Wear gloves when handling and keep away from pets and children.
Watering this delicate collector's species frequently, causing stem and root rot.
Repot very carefully every 3 years in spring, disturbing the roots as little as possible. Use a perforated hanging terracotta pot, just one size larger.
Fertilise very lightly once a month in spring and summer with liquid cactus fertiliser at 25% of the standard dose. Never fertilise in autumn and winter.
Uses & Applications
Precautions / Toxicity
TOXIC — bufadienolides present as in the entire genus; dangerous to pets and livestock. Do not expose to animals that may browse the pendant stems.
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"C. pendens is the only Cotyledon with a genuinely pendant habit; in nature it can cover cliff walls several meters across with its trailing stems, forming plant curtains visible from a distance. It was first described in 1977 by Ernst Van Jaarsveld, who discovered it in the Transkei."
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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.