Gymnocalycium mostii also known as Gymnocalycium bicolor and Gymnocalycium grandiflorum, among other names, is a plant in the Cactaceae family that is native to Argentina. G. mostii has a globose stem, with a height of up to 3-6 inches and a diameter of 7-8 inches maximum. The long, curved spines are about 1-2 inches, protruding from aereoles with a dramatic notching or "chin" just below each aereole. It produces small but dramatic pink blooms. G. mostii prefers a well-draining soil mix suitable for most cactus and succulents and a place in full sun to partial shade. USDA Hardiness Zones 9-11.
Gymnocalycium mostii seeds should be spread across the surface of a sterilized cactus substrate mix. Cover the seeds with a thin layer of substrate mix and mist the surface to settle down the soil and seeds. Cover with a humidity bag, dome, or plastic wrap. Keep in a warm place with partial shade. Seeds will germinate best with high temp in the day and low temp at night. 70-80°F is the ideal temperature range. Seeds should germinate within 7-20 days. Mist or bottom water when the soil is almost dry. Even with optimal conditions, some seeds may have slow and sporadic germination. Place established plants in full sun to partial shade. Too much shade will make cactus and succulents etiolate during growth.
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