Argyroderma planum L.Bolus
Flat silver stone
Argyroderma planum is a mesemb endemic to the quartz fields of Namaqualand. Its epithet 'planum' refers to the relatively flat top of the body formed by two succulent leaves, giving it a lower, flatter profile compared to other species in the genus such as A. delaetii or A. testiculare. This morphology may be an adaptation to a specific type of flat pebbles in its native habitat.
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Argyroderma |
| Growth Habit | Acaulescent perennial succulent with a flattened profile body; pair of succulent leaves with a flatter appearance on top. Active growth in autumn-winter. |
| Conservation Status | Least concern (LC); fragile and restricted Namaqualand quartz field habitat. |
| pH Target | 6.5–7.5 |
| Type | Very sandy, extremely well-drained, low in nutrients |
Origin & Habitat
Morphology
Pair of fused succulent leaves with a comparatively flatter top than in other species. Smooth surface, greyish-silver color.
ecoSolitary flowers emerging from the central cleft, in yellow or pink tones; numerous linear petals with yellow stamens.
ecoDeep, storage root system adapted to poor quartzitic substrates.
ecoPlant with a lower profile than most Argyroderma, with the top of the body flattened. Mimicry with flat pebbles.
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Requirements
Soil & Substrate
Type
Very sandy, extremely well-drained, low in nutrients
groups Beneficial Associations
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Propagation Strategy
- 1 Sow in autumn in fine mineral sand; do not cover seeds
- 2 Keep moist under glass at 15–22 °C
- 1 Divide in autumn; callous and plant in mineral sand
S
Watering in summer
Every 3–4 years in autumn
Very diluted mineral fertilizer once in autumn from year two.
Uses & Applications
Precautions / Toxicity
Non-toxic
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Plant Health
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"The flattened profile of A. planum reduces the surface area exposed to direct solar radiation, possibly a thermal adaptation to avoid overheating in the hottest months of the year."
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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.