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Mammillaria geminispina (Twin-spined Cactus)

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Scientific Name

Mammillaria geminispina Haw.

Common Names

Twin-spined Cactus, Whitey, White Cactus

Synonyms

Mammillaria elegans, Mammillaria nivea, Mammillaria nobilis

Scientific Classification

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

Description

Mammillaria geminispina is a globular cactus, forming a mound of clustered stems up to 8 inches (20 cm) tall, with white radial and longer brown central spines. Long-lasting rings of pinkish to carmine red flowers provide beautiful contrast to white, woolly body. The flowers are up to 0.6 inch (1.5 cm) in diameter. It can take 7 to 8 years before flowering.

Photo via wikipedia.org

Hardiness

USDA hardiness zone 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C).

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 emerge from the axils of these tubercles on the previous year's growth, which accounts for their interesting halo effect. It's imperative that the cactus is not 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 cacti, 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 Mexico.

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