Mammillaria theresae Cutak
Cochemiea theresae, Mammillaria saboae var. theresae
This species is native to Mexico. It occurs on limestone outcrops in Corneto Pass in the state of Durango.
Mammillaria theresae is a charming small cactus with subglobose to cylindrical, usually solitary or sparingly clustered stems covered with clusters of short, white to yellowish-white spines. The stems are green with a red or magenta hue. They are up to 2 inches (5 cm) tall and 1.2 inches (3 cm) in diameter. Flowers are funnel-shaped, pink with pale yellow stigmas, up to 2 inches (5 cm) long and up to 1.4 inches (3.5 cm) in diameter. They appear mainly in spring but also sporadically throughout summer. This species has cryptocarpic fruits, meaning fruit and seeds are produced and retained inside the stems. They are club-shaped and up to 0.4 inches (1 cm) long.
USDA hardiness zones 10a to 11b: from 30 °F (−1.1 °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 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 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.
- Back to genus Mammillaria
- Succupedia: Browse succulents by Scientific Name, Common Name, Genus, Family, USDA Hardiness Zone, Origin, or cacti by Genus
Click on a photo to see a larger version.