Mammillaria perezdelarosae Bravo & Scheinvar
Escobariopsis perezdelarosae, Mammillaria bombycina subsp. perezdelarosae, Mammillaria perezdelarosae subsp. andersoniana, Mammillaria perezdelarosae subsp. perezdelarosae
This species is native to central Mexico. It occurs in Jalisco at elevations from 6,560 to 8,200 feet (2,000 to 2,400 m).
Mammillaria perezdelarosae, also known as Mammillaria bombycina subsp. perezdelarosae, is a beautiful small cactus with globular to cylindrical stems with conical tubercles tipped with dense clusters of spines. The stems are up to 6 inches (15 cm) tall and 2 inches (5 cm) in diameter, solitary at first but slowly produce offsets as it matures. Each areole bear 30 to 60 white, about 0.1 inches (0.25 cm) long radial spines, and usually one hooked, dark-brown, up to 0.6 inches (1.5 cm) long central spine. Flowers are greenish-white, cream, or light pink with a slightly darker mid stripe. They are cup-shaped, up to 0.8 inches (2 cm) long and 1 inch (2.5 cm) in diameter, and appear at the top of the stems in late winter and spring. Fruits are red, smooth, and club-shaped and contain brownish-black seeds.
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, 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, ensure fertilizer during the growing season for the best results.
Repot as needed, preferably during the warm season. To repot a cactus, ensure the soil is dry before repotting, then gently remove the pot. Next, remove the old soil from the roots, removing any rotted or dead roots.
See more at How to Grow and Care for Mammillaria.
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