Mammillaria haageana Pfeiff.
Mammillaria haageana subsp. haageana, Mammillaria donatii, Mammillaria dyckiana, Mammillaria kunthii
Mammillaria haageana is a small cactus with a spiny, glaucous green, globular or somewhat elongated, usually solitary stem with a woolly apex. The stem can grow up to 6 inches (15 cm) tall and 4 inches (10 cm) in diameter. The tubercles are 4-angled, tipped by white spines radiating like a star, making the stem look lace-covered. Each areole bears usually 8 to 30 white radial and 2 longer, black to reddish central spines that turn grey with age.
The flowers are funnel-shaped, deep magenta-pink to pale pink, and measure up to 0.4 inches (1 cm) long and 0.8 inches (2 cm) in diameter.
USDA hardiness zones 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, Mammillaria feature raised tubercles, from which spines emerge. When you water, the tubercles will expand to increase water storage. The flowers emerge from the axils of these tubercles 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, ensure to fertilize during the growing season for the best results.
Repot as needed, preferably during the warm season. To repot Mammillaria, ensure the soil is dry before repotting, then gently remove the pot. Knock away the old soil from the roots, removing any rotted or dead roots. Treat any cuts with a fungicide. Place the plant in its new pot and backfill it with potting soil, spreading the roots as you repot. Leave the plant dry for a week or so, then begin to water lightly to reduce the risk of root rot.
See more at How to Grow and Care for Mammillaria.
Mammillaria haageana is native to Mexico.
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