# Chestnut Cactus (Frailea castanea)

> Frailea castanea is a captivating miniature cactus renowned for its flat, disc-shaped body, dark chocolate to purplish epidermis, and tiny pectinate spines pressed against the ribs. It is celebrated for its cleistogamous habit, frequently setting abundant seed in closed flower buds without ever opening unless subjected to intense warmth and sunlight. Naturally growing nearly flush with the ground, it is a prized specialty plant among succulent connoisseurs.

- **Scientific Name:** *Frailea castanea*
- **Botanical Family:** Cactaceae
- **Care Difficulty:** Moderate (2/5)
- **Cold Hardiness:** 0°C (USDA Zone 10a)
- **Pet Safety / Toxicity:** Pet-Safe (Non-toxic to cats and dogs)
- **Canonical URL:** https://sukulentler.com/en/species/frailea-castanea
- **Markdown Source:** https://sukulentler.com/en/species/frailea-castanea.md
- **Botanical Photo:** https://sukulentler.com/assets/images/articles/species_frailea_castanea.webp?v=1794607283

## Light & Sun Exposure

Bright, filtered sunlight is optimal; strong indirect light preserves its deep purple-brown pigmentation, but harsh direct summer sun can cause scorching.

## Watering Schedule & Method

Water thoroughly using the soak-and-dry method during active growth; reduce watering to an absolute minimum during winter dormancy, allowing the disc to contract naturally.

## Soil & Gritty Mix Formula

70% Inorganic Minerals (Pumice, Zeolite, Lava Rock) + 30% Gritty Cactus Peat

## Cold Tolerance & Overwintering

0°C (USDA Zone 10a)

## Propagation Methods

Readily propagated from cleistogamous seeds (best sown fresh); rarely propagated via division of small basal offsets.

## Available Language Editions

- [TR: Kestane Kaktüsü (Frailea castanea)](https://sukulentler.com/tr/turler/frailea-castanea.md)
- [DE: Kastanienkaktus (Frailea castanea)](https://sukulentler.com/de/arten/frailea-castanea.md)
- [ES: Cactus Castaña (Frailea castanea)](https://sukulentler.com/es/especies/frailea-castanea.md)