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Bright filtered sun. Protect from intense afternoon sun to prevent scorching.
Reference image Copiapoa laui
Lau's Copiapoa
Overview
Copiapoa laui is the smallest and one of the most highly prized species within the genus Copiapoa (family Cactaceae). Its miniature size makes it an exceptional specimen for specialized collections.
Taxonomy and Naming
Named after its discoverer Alfred Bernhard Lau, this species is a distinct miniature succulent subshrub. It represents an extreme adaptation of the genus towards miniaturization 1.
Distribution and Habitat
This species is micro-endemic to the coastal cliffs of the Atacama Desert in northern Chile, specifically near El Cobre 2. It survives in one of the driest places on Earth, relying almost entirely on coastal fog.
Appearance
The globose stems are tiny, reaching only 1 to 3 cm in diameter, often forming dense cushions. The body color ranges from olive-green to reddish-brown, arising from a massive taproot. Pale yellow flowers emerge from the woolly apex.
Cultivation
It requires a strictly mineral-based, porous substrate to accommodate its large taproot. Watering must be sparse during the growing season and entirely withheld in winter 1.
Common Mistakes
Using standard organic potting soil is the leading cause of root rot. Overwatering or lack of ventilation, especially in humid conditions, will quickly destroy the sensitive root system.
References
Watering
12-30 Days
Water only when the substrate is completely dry. Keep bone dry in winter.
Soil
Extremely well-draining, pumice and sand-based mineral soil mix.
Purely mineral mix. Highly porous with pumice, grit, and no peat.
Safety
Pet Friendly
Non-toxic to pets, but features small spines that require careful handling.
Difficulty
Moderate
Moderate care; sensitive to excess moisture and requires precise soil mix.
Native Habitat
Chile, Atacama Desert
Endemic to the rugged coastal hills of El Cobre in Chile's Antofagasta region. It thrives in an hyper-arid environment where liquid rainfall is scarce, depending instead on the condensing coastal fog known as Camanchaca.
Frequently Asked Questions
How big does Copiapoa laui grow?
*Copiapoa laui* is one of the smallest cacti in the world. Individual stems rarely exceed 1 to 3 cm in diameter, though they slowly offset to form tight mounds.
How often should I water this cactus?
Water only when the substrate is completely dry (roughly every 10-14 days in summer). Keep completely dry during the winter months to prevent rot.
What soil mix should I use?
Use a completely mineral-based soil mix free of organic peat. A combination of pumice, lava grit, and coarse quartz sand is ideal.
Does Copiapoa laui flower?
Yes, mature plants produce bright, funnel-shaped yellow flowers from the woolly apex, typically during the summer months.
Is it toxic to pets?
No, *Copiapoa laui* is non-toxic and safe for pets. However, keep it out of reach to avoid injury from its small spines.
Can it tolerate direct sunlight?
It loves bright light but can scorch under intense summer midday sun. Filtered sunlight or light afternoon shade is best.
How fast does it grow?
It is an extremely slow-growing cactus. It can take several years to show significant growth from seed or offsets.
Why is the stem getting soft?
Softening is usually a sign of root rot caused by overwatering. Stop watering immediately and check the health of the taproot.
What temperature does it need in winter?
During its winter dormancy, it prefers dry and cool conditions between 5°C and 10°C. Protect it from freezing temperatures.
How does it survive in its natural habitat?
In the Atacama Desert where rainfall is virtually zero, the plant survives by absorbing moisture from dense morning coastal fogs.