Crassula rupestris Thunb.
Rosary Vine / Bead Vine / Rock Crassula
Crassula rupestris, called the "rosary vine" or "rock buttons", is a shrubby to climbing succulent of rocky outcrops in the Cape Province and Namibia. It is morphologically similar to C. perforata, with which it is frequently confused, but has rounder leaves and more robust stems. It forms dense, branched mats that in its natural habitat climb through rock crevices, from which its specific epithet derives (rupestris = of the rocks).
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Overview
| Category | Classification |
|---|---|
| Family | Crassulaceae |
| Genus | Crassula |
| Growth Habit | Shrubby climbing succulent |
| Conservation Status | Least Concern |
| pH Target | 6.0 – 7.5 |
| Type | Very mineral, stony, excellent drainage, low in organic matter |
Origin & Habitat
Morphology
Ovate to nearly circular leaves, 1–2.5 cm long, fleshy and thick, grey-green to blue-green in colour with frequently reddish or pink margins. The leaves are arranged in decussate pairs that partially clasp or encircle the stem; their thickness and roundness is greater than in C. perforata.
ecoThicker and woodier stems than C. perforata, 3–8 mm in diameter, erect to arching, becoming prostrate and climbing with time. Branched from the base, they form dense clumps 30–60 cm tall or wide.
ecoSmall, star-shaped flowers white to pale pink, 4–6 mm long, grouped in dense terminal corymbs. Flowering occurs mainly in spring and early summer. The flowers are fragrant and attract pollinating insects.
ecoRobust fibrous roots adapted to growing in rock crevices with scarce substrate. Produces adventitious roots at nodes when stems rest on moist substrate. Tolerates periods of severe drought thanks to water reserves in stems and leaves.
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Requirements
Soil & Substrate
Type
Very mineral, stony, excellent drainage, low in organic matter
groups Beneficial Associations
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Propagation Strategy
- 1 Cut a thin stem segment 6–10 cm long with sterilised scissors, including pairs of stacked round leaves.
- 2 Remove the basal pair of leaves.
- 3 Allow to cure in shade for 2–3 days.
- 4 Plant in cactus mix with perlite; C. rupestris's wiry stems can also be bundled together for a bushy effect.
- 5 Water lightly and place in full light.
- 1 Remove the clump from its pot in spring; C. rupestris develops multiple wiry stems from the base.
- 2 Separate stem clusters with roots using fingers or a sterilised knife.
- 3 Plant each cluster in an individual pot with cactus mix.
- 4 Water moderately.
The wiry stems with stacked round leaves create a very decorative texture; grow in a hanging pot or at the edge of a shelf to appreciate the trailing form.
Watering the thin wiry stems too frequently, causing basal rot that is difficult to detect until it is too late.
Repot every 2 years in spring or when the clump has completely filled the pot. It is a good time to divide and create new plants.
Fertilise lightly once a month in spring and summer with succulent fertiliser at 50% dose. No fertilisation in autumn and winter.
Uses & Applications
Precautions / Toxicity
Low to moderate toxicity for pets; no serious effects reported in humans with normal contact.
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"Crassula rupestris, growing in rock crevices, actively contributes to pedogenesis in its native habitat: its roots secrete organic acids that accelerate rock weathering and enrich the microhabitat with organic matter, acting as a pioneer species in the colonisation of rocky substrates."
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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.