Old lady cactus (Mammillaria hahniana)
Care, watering, light and tips for Old lady cactus on Floravia.
Quick facts
- Family: Cactaceae
- Difficulty: Easy to care for
- Watering: every 21 days
- Light: Full sun
- Temperature: 10–40 °C
About Old lady cactus
Mammillaria hahniana, commonly known as 'Old Lady Cactus', is a small, globular cactus native to Mexico. It is characterized by its dense covering of white spines and fine, hair-like bristles, giving it a soft, cottony, beard-like appearance. It's an excellent choice for cactus collections, rock gardens, or as an indoor potted plant, adding an exotic and decorative touch.
Native range
Hidalgo, Querétaro, and Guanajuato, Mexico
Care tips
This cactus thrives in abundant, direct sunlight for optimal growth and prolific flowering. Watering should be moderate during spring and summer, allowing the substrate to dry out completely between waterings, and almost non-existent in winter to prevent rot. Use a very porous and well-draining substrate, specifically formulated for cacti. A common mistake is overwatering, especially in winter, which quickly leads to basal rot.
How to save a dying Old lady cactus
- Warning signs
- Soft/black base (rot), brown/red spots (fungus/sun), no growth.
- First aid
- Remove from pot, check roots. If rot, cut affected part, let dry.
- What kills it
- Overwatering, especially in winter. It's its silent killer!
- Can it be saved?
- Yes, if rot hasn't advanced too much. Act quickly and carefully.