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PlantSnap
Plant Care
Old lady cactus
(Mammillaria hahniana)
Also Known As
Old lady cactus, Hahn's mammillaria
About This Plant
Mammillaria hahniana is a small cactus species native to Mexico. It has cylindrical stems covered in white spines and pinkish flowers that bloom in the spring.
Plant Care Instructions
Outdoor Size Range
6-12 inches (15-30 cm)
Light Requirements
Mammillaria hahniana prefers bright, indirect sunlight. It can tolerate some direct sunlight, but too much can scorch the plant.
Humidity Needs
Mammillaria hahniana prefers dry air and does not require high humidity.
Fertilizing Schedule
Feed Mammillaria hahniana with a cactus fertilizer once a month during the growing season (spring and summer). Do not fertilize in the winter.
Pruning Guidelines
Mammillaria hahniana does not require pruning, but you can remove any dead or damaged stems with clean, sharp scissors.
Common Pests and Diseases
Common pests for Mammillaria hahniana include mealybugs and spider mites. Watch for signs of infestation, such as webbing or white cottony spots on the plant.
Indoor Size Range
6-12 inches (15-30 cm)
Watering Schedule
Water Mammillaria hahniana deeply but infrequently, allowing the soil to dry out completely between waterings. In the winter, reduce watering to once a month or less.
Temperature Range
Mammillaria hahniana prefers temperatures between 60-80°F (15-27°C). It can tolerate temperatures as low as 50°F (10°C) and as high as 90°F (32°C).
Growing Season
Mammillaria hahniana grows actively in the spring and summer, and goes dormant in the winter.
Growing Difficulty Level
Mammillaria hahniana is easy to grow and care for, making it a great choice for beginners.
USDA Hardiness Zones
Mammillaria hahniana is hardy in USDA zones 9-11.
Did You Know?
The white spines on Mammillaria hahniana are actually modified leaves, known as 'glochids'. They are barbed and can easily detach from the plant, causing skin irritation if touched.
