Gymnocalycium oenanthemum is a flattened globose cactus native to Argentina where it grows in dry rocky conditions. The plant grows between 1.5 to 3 inches tall and 3 to 4 inches in diameter with long inward curved spines that vary in color from white to gray to dark brown. The epidermis is dark to blueish green and the stem itself has 11 to 13 sharply obtuse angled ribs. Gymnocalycium oenanthemum blooms in spring to early summer with bright red to pink flowers. Gymnocalycium oenanthemum is grown as an ornamental cactus for its small size and showy bright flowers. It is also grown as a conservation method as this species is threatened in habitat due to over collection. This plant prefers full sun and thrives in well-draining soil. Water adequately during summer and keep dry during winter as the species is prone to rot. Allow the soil to completely dry out in between waterings. USDA plant hardiness zones 9 to 11.
Gymnocalycium oenanthemum seeds require consistent moisture and humidity to germinate, but the soil should not be 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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