Old Lady Cactus
Mammillaria hahniana
Hahniana
About this plant
Mammillaria hahniana, commonly called the Old Lady Cactus, is a small, round cactus covered with dense white spines that look like soft hair. It produces small pink or purple flowers in a ring near the top. This cactus is popular as a houseplant because of its attractive appearance and easy care.
Taxonomy
- Genus
- Mammillaria
- Family
- Cactaceae
- Higher classification
- Order Caryophyllales
- Plant type
- Succulent
- Lifespan
- Perennial
Origin & Distribution
- Native region
- Mexico
- Distribution
- Native to central Mexico; widely grown worldwide as a houseplant.
Care
- Light preference
- Full sun
- Suitable locations
- Indoor, Balcony, Greenhouse
- Preferred window facing
- South-facing, West-facing, East-facing
- Watering frequency
- Rare
- Watering interval
- 14–21 days
- Humidity
- Low
- Minimum
- 7 °C
- Maximum
- 35 °C
- Optimal
- 18-26 °C
- USDA hardiness zones
- 9-11
- Soil pH
- 6.0-7.5 (slightly acidic to neutral)
- Soil type
- well-draining cactus or succulent mix
Watering. Water sparingly, allowing soil to dry completely between waterings. Reduce watering in winter to prevent root rot.
Fertilizing. Feed with a diluted cactus fertilizer once a month during the growing season (spring and summer). Avoid fertilizing in winter when the plant is dormant.
Mammillaria hahniana is a tough cactus that needs bright light and very little water. It prefers well-draining soil and can suffer if overwatered. It requires minimal maintenance and is suitable for beginners.
Propagation
- Propagation methods
- Seeds, Cuttings, Offsets
- Care difficulty
- Easy
Ornamental features
- Flowering
- Yes
- Flowering period
- spring
Dense white spines resembling hair, pink to purple ring of flowers near the top, rounded form.
Toxicity & Safety
- Toxic to humans
- Non-toxic
- Toxic to pets
- Non-toxic
- Weed potential
- Not considered a weed
Non-toxic to humans and pets. Safe to keep around children and animals, but avoid contact with spines.
Allergy information
- Allergy risk
- Low
- Allergy triggers
- Skin contact
- Pollen level
- Low
Mammillaria hahniana is a cactus that generally does not cause allergies. However, some people might be sensitive to its spines if touched, which can cause minor skin irritation. To avoid problems, handle the plant carefully and wear gloves when repotting or pruning.
Common problems
Overwatering can cause root rot. Insufficient light may lead to weak growth. Watch out for pests like mealybugs.
Uses
Popular ornamental houseplant and collector's cactus due to its unique appearance and flowers.
Notes
Handle carefully due to sharp spines. Repot every 2-3 years in spring using fresh cactus soil. Avoid cold drafts and temperatures below 7°C (45°F).