Mammillaria grahamii, also known as Graham's nipple cactus, is a globus to columnar cactus plant in the family Cactaceae. M. grahamii is native to southern California and Mexico. The bright green stems are covered in thin gray radial spines with long upright dark brown central spines that are hooked at the tip. Mammillaria grahamii grows up to 8 inches tall with a 3 inch diameter. The flowers are larger than others in the genus and bloom in early summer with a bright pinkish to purple color. M. grahamii is grown as an ornamental plant for its small size and large bright flowers. Mammillaria grahamii 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 grahamii 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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