Mammillaria geminispina, commonly known as the twin spined cactus, is a globus mound cactus plant in the family Cactaceae. M. geminispina stems are light green and densely covered by white spines and white fuzz on their areoles. The stems grow up to 10 inches in height and 3 inches in diameter. M. geminispina blooms in summer and winter with magenta colored flowers. This species is grown as an ornamental plant for its white ball shaped stems and larger size when mature. Mammillaria geminispina grows best in full sun to partial shade while sitting in well-draining soils. Water the plant adequately during summer and keep dry during winter as it is prone to rot. It is a drought-tolerant species and can tolerate a wide range of temperatures. Allow the soil to completely dry out in between waterings. USDA plant hardiness zones 9b to 11b.
Mammillaria geminispina seeds require consistent moisture and humidity to germinate, but the soil should not remain soaking wet. Cloning boxes, ziplock bags, and other containers that retain humidity are ideal to store sown pots. Use a well-draining sterilized soil mix. Seeds should be sown directly on top of the potting mixture and lightly covered with a thin layer of sand or potting mix, just enough to cover the seeds. Germinating pots should be kept indoors, out of extreme light and heat. Ideal germination temperatures range from 70°F to 80°F. Germination typically takes 1 to 3 weeks to occur. Even with optimal conditions, germination may be slow and sporadic.
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