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Frailea cataphracta

Shield Cactus

Overview

Frailea cataphracta is a highly prized miniature cactus species belonging to the family Cactaceae. It is celebrated among succulent enthusiasts for its tiny, globose, and flattened stem, which features remarkable dark crescent-shaped markings 1.

Taxonomy and Naming

The genus name Frailea honors Manuel Fraile, a Spanish-born gardener who curated the USDA cactus collection. The species epithet cataphracta translates to 'armored' or 'clad in mail' in Latin, referencing the protective-looking crescent marks beneath the tubercles 2.

Distribution and Habitat

This species is native to central South America, primarily distributed across Paraguay, southern Brazil, and eastern Bolivia. It thrives in subtropical biomes, typically growing on rocky outcrops, sandy soils, and under the light shade of deciduous shrubs 3.

Appearance

Its stem is solitary or slowly clustering, flattened-globose, reaching about 2-4 cm in diameter. The body color ranges from dull green to reddish-purple, adorned with small, appressed, cream-colored spines. The most striking feature is the dark purple, crescent-shaped band located directly under each areole. It produces yellow, scentless flowers that are often cleistogamous, producing fertile seeds without ever opening 1.

Cultivation

Unlike larger cacti, this miniature species prefers bright, filtered light rather than scorching direct sun. It requires highly porous, mineral-rich soil and regular watering during summer, with a dry, cool winter rest 2.

Common Mistakes

Overwatering in organic-heavy soils and lack of ventilation are the primary causes of root rot. In winter, keeping the plant warm and wet prevents its natural dormancy 3.

Bibliography

References

  1. Anderson, E. F. (2001). The Cactus Family. Timber Press. ↩
  2. Hunt, D. (2006). The New Cactus Lexicon. DH Books. ↩
  3. IUCN Red List. (2013). Frailea cataphracta. ↩
Light

Bright Indirect Light

Bright indirect light or filtered morning sun is perfect; avoid intense midday sun.

Watering

7-25 Days

Allow the substrate to dry out entirely between waterings. Keep dry in winter.

Soil

Highly-drained, sandy, pumiceous soil with minimal organic matter

Use a mineral-heavy potting mix with plenty of pumice, coarse sand, and perlite.

Safety

Pet Friendly

Non-toxic and safe for homes with cats and dogs.

Difficulty

Moderate

Moderate; vulnerable to rot if kept in soggy soil due to its small root system.

Native Habitat

Paraguay, Bolivia, Brazil

Found in the subtropical regions of Paraguay and Brazil, growing among pebbles and under sparse vegetation that filters the harsh sunlight.

Frequently Asked Questions

Is Frailea cataphracta easy to grow indoors?
Yes, its miniature size makes it perfect for windowsills, though careful watering is essential to prevent rot.
Why do the flowers turn into seeds without opening?
This species is **cleistogamous**, meaning the flowers often self-pollinate and set seed without ever opening.
How often should I water it?
Water roughly once a week in summer after the soil dries completely. Keep it dry in winter.
What type of soil should I use?
Use a highly-drained, mineral-based cactus mix containing plenty of pumice, perlite, and coarse sand.
Does it need direct sunlight?
No, direct intense sun can cause sunburn or excessive purple stress; bright filtered light is ideal.
What winter temperatures can it tolerate?
It can tolerate down to 5°C for short periods if kept completely dry. Ideal winter temp is 8-12°C.
Is it toxic to pets?
No, Frailea cataphracta is non-toxic and safe for cats, dogs, and other household pets.
How big does it get?
It is a true miniature cactus, rarely exceeding 4-5 centimeters in stem diameter.
Are the dark stripes on its body normal?
Yes, the crescent-shaped dark purple/brown markings beneath the tubercles are its natural, defining feature.
How often should it be repotted?
Due to its tiny root system, repotting is only necessary every 2-3 years into a slightly larger container.