Gymnocalycium SAGLIONIS

Gymnocalycium is a genus of plants in the cactus family (Cactaceae), comprising about 70 species widely distributed in South America, particularly in Argentina, Brazil, Paraguay, Uruguay, and Bolivia at elevations of 800–3000 m (2620–9840 ft) above sea level, on granitic and clayey soils.

Gymnocalyciums are valued for the elegant outlines of their stems, usually globular and flattened, with diameters from 4 to 15 cm (1.6 to 5.9 in), while their height is roughly half the diameter. The primary body coloration varies from grayish-green to brownish-green, occasionally with an almost gray or brownish tone. In certain cultivars, unusual red or yellow stems devoid of chlorophyll occur; such plants can only survive when grafted. The stems are typically distinctly ribbed, with tubercles situated along the ribs. The spines are moderately rigid, frequently curved outward.

The plants are prized for their showy blooms. The flowers are funnel-shaped with a short tube, developing from areoles at the stem apex and opening during the day. The flower tubes in members of this genus, unlike most other cacti, lack bristles and hairs, and are covered with smooth scales. Coloration ranges from white and pink to red, yellow, greenish, or brownish-yellow. The fruits are oblong, fleshy or dry, containing large black seeds with a surface texture characteristic of the genus.

Gymnocalycium saglionis has a fleshy, ball-shaped stem. The diameter can reach up to 30 cm (12 in). The body is covered with flat spherical tubercles and dark brown or nearly black spines, which are divided into central and radial ones. The spines are notable for their arched, curved shape. The plant blooms with eye-catching white or pink bell-shaped flowers sitting on a short tube.

Seeds are sown on the surface of a moist substrate with a pH of around 6.5. Containers are covered with a lid, and ventilation is provided. Germination temperature is 22–26 °C (72–79 °F).

Seedlings emerge in 7–15 days. Maximum germination time is up to 25 days. Pricking out is performed when the first spines appear. Young seedlings develop quickly and tolerate transplanting well.

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It is placed on south or east-facing windows with access to bright diffused light. In spring and summer, some direct sun is tolerated. Regular ventilation is desirable, especially in hot weather.

Summer temperatures are maintained at 22–28 °C (72–82 °F). In winter - 8–12 °C (46–54 °F) under complete dormancy. Watering is carried out moderately after the substrate has completely dried out. In wintertime, watering ceases completely.

A loose mineral substrate is used with additions of leaf mold, sand, and brick grit. Repotting is carried out in spring when needed. Good drainage is mandatory.

During the growing period, mineral feedings are applied once every 3–4 weeks. Cactus fertilizers with low nitrogen content are used. In autumn and winter, fertilizers are not applied.

Shaping is not required. Propagation is carried out by seeds. Occasionally, offsets may form on mature plants. Flowering begins in the 3rd–4th year if dormancy conditions are respected.