Mammillaria Senilis

Common Names: Old Man Cactus, Snowball Cactus, White-haired Cactus

Appearance

Small, globular cactus covered in dense, white, hair-like spines, giving it a fuzzy appearance.

Features long, needle-like red or yellow spines protruding through the white fuzz.

Typically grows up to 6 inches (15 cm) tall and 3 inches (7.5 cm) wide.

Care & Growing Conditions

Light: Prefers full sun to partial shade; bright light enhances spine development.

Soil: Well-draining, sandy, or cactus mix soil.

Watering: Water sparingly; allow the soil to dry out completely between waterings.

Temperature: Thrives in USDA zones 9-11; not frost-hardy and should be kept above 30°F (-1°C).

Humidity: Prefers dry conditions and does not tolerate excess moisture.

Flower

Produces vibrant red or pink flowers in late winter to early spring.

Flowers emerge in a ring near the top of the cactus.

Toxicity

Non-toxic to humans and pets, but the sharp spines can cause irritation if touched.