Epithelantha micromeris (Engelm.) F.A.C.Weber ex Britton & Rose
Button Cactus, Living Rocks, Pingpong Ball Cactus
Mammillaria micromeris (basionym), Epithelantha micromeris subsp. micromeris, Epithelantha micromeris var. micromeris, Epithelantha petri
Epithelantha micromeris is a cactus characterized by its white-grey spines growing on a globular shaped stem. The density of its white spines give it the illusion of being completely grey, making it very difficult to see the green color beneath. It grows to be up to 2 inches (5 cm) tall, and up to 1.6 inches (4 cm) in diameter. It produces small, pink-white flowers, often considered to be some of the smallest of the cacti. These flowers give way to a bright red, cylindrical fruit which contains several black seeds and also is edible.
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
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