Parodia haselbergii subs. graessneri is a small globus clustering cactus plant in the family Cactaceae. Parodia haselbergii is native to southern Brazil and is considered a tropical cactus. They are a short cactus, growing around 4 inches in height and 6 inches in diameter. Thin, bristle-like, yellow spines cover the deep green stem almost entirely. The stem is slightly flattened at the apex and plants are often found growing at an angle to reduce water pooling at the meristem. P. haselbergi bloom in late winter and early spring with each flower lasting 1 to 3 weeks. Flowers are typically yellowish-green however, some cultivars are reported to be bright yellow or orange flowers. P. haselbergi is grown as an ornamental cactus for its small size and bright flowers. P. haselbergi 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 the species is prone to rot. Allow the soil to dry out completely in between waterings. USDA plant hardiness zones 10a to 11b.
Parodia haselbergii subs. graessneri 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 75°F to 85°F. Germination typically takes 1 to 2 weeks to occur. Even with optimal conditions, germination may be slow and sporadic.
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