Mammillaria celsiana, commonly known as the golden pincushion cactus, is a cactus plant belonging to the Cactaceae family. M. celsiana is native to central Mexico where it is found growing in lime rock rich soils. This species is sometimes known to dichotomously branch to form a mound in maturity. Mammillaria celsiana is a small to medium, globose cactus that typically grows up to 6 inches in height and 1 to 2 inches in diameter. The stem of the plant is green to blue-green in color and is covered in short golden yellow to gray spines. M. celsiana blooms in spring and summer with bright purple flowers emerging from the areoles. Each flower measures no more than a half inch in diameter. M. celsiana is grown as an ornamental plant for its small size and showy flowers. Mammillaria celsiana 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 celsiana 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. 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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