Argyroderma roseum (Haw.) Schwantes
Rose-flowered argyroderma
Argyroderma roseum is one of the most popular and recognizable species in the genus, endemic to the quartz fields of Namaqualand, South Africa. Its intense rose-carmine flowers clearly distinguish it within the genus. It was originally described by Haworth as Mesembryanthemum roseum and later recombined by Schwantes into Argyroderma. It is a well-established species in succulent horticulture worldwide.
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Overview
| Category | Classification |
|---|---|
| Family | Aizoaceae |
| Genus | Argyroderma |
| Growth Habit | Acaulescent perennial succulent; body formed by 1–2 pairs of globose to ovoid-compressed leaves, greyish-white to silvery. Active growth in autumn-winter; strict summer dormancy. |
| Conservation Status | Least Concern (LC) locally; the species maintains populations across several quartz fields in Namaqualand though the habitat is under pressure. |
| pH Target | 6.5–7.5 |
| Type | Very sandy, extremely well-drained, low in nutrients |
Origin & Habitat
Morphology
Two very succulent leaves fused into a globose to ovoid body. Smooth surface, grey-silvery color, nearly buried in the substrate. Pronounced apical cleft.
ecoSolitary bright rose-carmine flowers with shiny linear petals, emerging from the apical cleft in autumn-winter. They are among the largest and showiest flowers in the genus.
ecoDeep, contractile roots anchoring the plant in the quartz and sand substrate. Ability to retract the body into the ground during summer drought.
ecoStony appearance with perfect lithophytic mimicry among white quartz pebbles. In flower it stands out greatly due to the contrast between the silvery body and the intense pink petals.
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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 very fine mineral sand without covering seeds
- 2 Keep moist under glass at 15–22 °C until germination
- 3 Very sensitive seedlings; ventilate daily and do not overwater
- 1 Divide in autumn at the start of active growth
- 2 Callous 2–3 days; plant in mineral sand
E
Watering in summer
Every 3–4 years in autumn
Very diluted mineral once in autumn from year two. Never in summer.
Uses & Applications
Precautions / Toxicity
Non-toxic
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Plant Health
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"A. roseum is the 'ambassador' of the genus Argyroderma in world horticulture. Its rose-carmine flowers have made it the most photographed species in the group and the gateway for many collectors to the fascinating world of lithophytic mesembs."
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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.