Dudleya pulverulenta (Nutt.) Britton & Rose
Chalk Dudleya / Chalk Liveforever
Dudleya pulverulenta, the Chalk Dudleya, is one of the most spectacular in the genus for its leaves densely covered in chalk-white farina, giving an almost monochromatic appearance. Distributed from Los Angeles County south to Baja California, it grows on gabbro, granite, and metamorphic rock cliffs along the Pacific coast and adjacent inland mountains.
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© Stan Shebs
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Overview
| Category | Classification |
|---|---|
| Family | Crassulaceae |
| Genus | Dudleya |
| Growth Habit | Simple to rarely branched rosette 25–50 cm diameter; solid, deep caudex; long-lived (can exceed 80 years). |
| Conservation Status | Not formally assessed; moderate distribution along California-Baja California coastal strip; threatened by coastal urbanization in San Diego County. |
| pH Target | 6.0 – 7.5 |
| Type | Gabbro-granitic, neutral to slightly alkaline, ultra-draining, exposed to marine wind. |
Origin & Habitat
Morphology
Spatulate-oblong leaves 10–25 cm long, covered in dense white farina nearly as abundant as D. brittonii; pale green base color; acute apex; entire margin; very firm and turgid consistency.
ecoRobust, buried caudex; near-acaulescent at surface; resists wildfire and resprouts from caudex reserves.
ecoInflorescences 40–70 cm (the tallest in the genus in California); tubular flowers intense red to carmine, 1.5–2 cm; May to July flowering; very attractive to hummingbirds (Calypte anna).
ecoDeep, robust roots reaching rock crevices 50–100 cm deep; the most developed in the genus in California.
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Requirements
Soil & Substrate
Type
Gabbro-granitic, neutral to slightly alkaline, ultra-draining, exposed to marine wind.
groups Beneficial Associations
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Propagation Strategy
- 1 Collect seeds after spring flowering; store dry until autumn.
- 2 Prepare highly draining mineral mix (60% sand + 40% fine grit or pumice).
- 3 Surface-sow without covering at 15–20 °C in bright indirect light.
- 4 Moisten by capillary action; germination in 3–6 weeks.
- 5 Keep seedlings in semi-moist conditions through the first winter.
- 6 Prick out individually in the second spring.
- 1 Wait for adult plant to produce basal offsets (does not always occur).
- 2 Detach with a scalpel in autumn when the offset rosette is at least 3 cm across.
- 3 Callus for 7–10 days in shade and dry air.
- 4 Plant in highly mineral substrate, withholding water for the first two weeks.
Maintain total drought from June to September — D. pulverulenta is very sensitive to summer moisture.
Watering in summer — the number-one cause of death in collections outside its natural habitat.
Every 4–5 years, in autumn. The fleshy roots prefer not to be disturbed frequently.
Low-nitrogen mineral fertilizer (5-10-10) diluted to 25%, once in early autumn. No fertilizer in summer or late spring.
Uses & Applications
Precautions / Toxicity
No documented toxicity; no adverse effects known in humans or animals.
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"D. pulverulenta is a keystone species in southern California coastal chaparral for pollination: its red tubular flowers from May to July are the primary nectar resource for Anna's Hummingbird (Calypte anna) during pre-breeding. Loss of this species from a chaparral patch reduces hummingbird reproductive density in that area."
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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.