Mammillaria hahniana

Old Lady Cactus (Mammillaria hahniana) is a houseplant in the Cactaceae family, native to BR. It is a direct sun-light species that thrives between 5000 and 15000 lux. Optimal indoor care calls for watering roughly every 21 days, temperatures of 10–35°C, and about 20% humidity. According to ASPCA data, it is non-toxic and considered pet-safe for cats and dogs. It is also known as old woman cactus.

ASPCA Pet Toxicity Determination

Toxic to Dogs? NO (Safe)

Toxic to Cats? NO (Safe)

Clinical Symptoms:

Chemically non-toxic, mechanical irritation from spines.

Quantitative Care Thresholds

Light Level Profile Direct Sun

Minimum Light Requirement 5000 Lux

Maximum Light Tolerance 15000 Lux

Watering Frequency Every 21 Days

Temperature Envelope 10°C – 35°C

Ideal Ambient Humidity 20% RH

Taxonomic & Field Verification

GBIF Usage Key 7280027

Native Biogeographical Range BR; Global; Mexico Northeast; Mexico Southwest; TW

🔬 Verify on GBIF Species Portal