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Mammillaria hahniana (Old Lady Cactus)

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Scientific Name

Mammillaria hahniana Werderm.

Common Names

Old Lady Cactus

Synonyms

Mammillaria hahniana subsp. hahniana

Scientific Classification

Family: Cactaceae
Subfamily: Cactoideae
Tribe: Cacteae
Subtribe: Cactinae
Genus: Mammillaria

Description

Mammillaria hahniana is a cactus with solitary or clustered stems covered with dense white bristles and fine spines. It grows up to 10 inches (25 cm) tall and up to 20 inches (50 cm) wide. Stems are up to 5 inches (12.5 cm) in diameter, at first spherical than cylindrical. Flowers are reddish-purple, up to 0.6 inches (1.5 cm) in diameter, appear in spring and summer, sometimes forming a complete ring around the stem's apex.

Mammillaria hahniana - Old Lady Cactus

Photo via ortosemplice.it

How to Grow and Care

To encourage better flowering, allow the plants to enjoy a cooling period in the winter and suspend watering. Unlike many other cacti, which use their ribs as storage devices, the Mammillaria feature raised tubercles, from which spines emerge. When you water, the tubercles will expand to allow for increased water storage. The flowers appear from these tubercles' axils on the previous year's growth, which accounts for their interesting halo effect. The cactus mustn't be exposed to prolonged dampness and sitting water. Never let your cactus sit in a dish of water. Lastly, make sure to fertilizer during the growing season for the best results.

Repot as needed, preferably during the warm season. To repot a cactus, make sure the soil is dry before repotting, then gently remove the pot. Knock away the old soil from the roots, making sure to remove any rotted or dead roots in the process. See more at How to Grow and Care for Mammillaria.

Origin

Native to central Mexico.

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