# Theresa's Cactus (Mammillaria theresae)

> Native to high-altitude plateaus in Durango, Mexico, Mammillaria theresae is a highly coveted miniature geophyte renowned for its tiny tubercles adorned with delicate, feather-like pectinate spines. In late spring, it produces breathtakingly large, funnelform magenta-purple blossoms that completely dwarf its diminutive stem. Featuring a thick taproot and cryptocarpic fruit embedded within the plant body, it is a true connoisseur species that demands disciplined cultivation.

- **Scientific Name:** *Mammillaria theresae*
- **Botanical Family:** Cactaceae
- **Care Difficulty:** Expert (4/5)
- **Cold Hardiness:** -4°C (USDA Zone 9b)
- **Pet Safety / Toxicity:** Pet-Safe (Non-toxic to cats and dogs)
- **Canonical URL:** https://sukulentler.com/en/species/mammillaria-theresae
- **Markdown Source:** https://sukulentler.com/en/species/mammillaria-theresae.md
- **Botanical Photo:** https://sukulentler.com/assets/images/articles/species_mammillaria_theresae.webp?v=1794700869

## Light & Sun Exposure

Requires bright, direct to lightly filtered sunlight; protect from intense midday summer sun.

## Watering Schedule & Method

Extremely rot-prone due to its taproot; water cautiously only after substrate is bone dry during growth, and keep entirely dry in winter.

## Soil & Gritty Mix Formula

80% Inorganic gritty mix (pumice, crushed lava, zeolite, coarse quartz grit) + 20% cactus compost; requires a deep pot.

## Cold Tolerance & Overwintering

-4°C (USDA Zone 9b)

## Propagation Methods

Propagated mainly by seed (cryptocarpic seeds carefully extracted from mature stems) or through grafting.

## Available Language Editions

- [TR: Theresa Memeli Kaktüsü (Mammillaria theresae)](https://sukulentler.com/tr/turler/mammillaria-theresae.md)
- [DE: Theresas Warzenkaktus (Mammillaria theresae)](https://sukulentler.com/de/arten/mammillaria-theresae.md)
- [ES: Biznaguita de Teresa (Mammillaria theresae)](https://sukulentler.com/es/especies/mammillaria-theresae.md)