Eriosyce AURATA

Eriosyce AURATA - Golden eriosyce, Eriosyce aurata, Echinocactus SANDILLON.

Eriosyce is a genus of cactus plants in the cactus family (Cactaceae), comprising about 30 species distributed in arid regions of Chile and Argentina. These plants are adapted to extreme conditions - scorching sun, scarce precipitation, and significant temperature fluctuations between day and night. In nature, many species inhabit rocky slopes and rock crevices, where moisture accumulation is minimal.

Representatives of the genus have a globose or cylindrical stem shape 4–12 cm (1.6–4.7 in) in diameter, with 13–21 dense ribs divided into compressed folds. The areoles are covered with dense tomentose pubescence, from which numerous spines emerge - from white to gray, yellowish, or brownish, straight, curved, or twisted. Radial spines are usually 15–40, up to 6 cm (2.4 in) long; central spines are 4–20, more robust. The stem surface is matte, grayish-green, brownish, or with a purplish tint. The root system is often napiform, thickened, and tuberous, which helps store moisture.

The flowers are funnel-shaped, 1–3 cm (0.4–1.2 in) long, appearing from young areoles at the apex of the stem. Their coloration varies from yellow and cream to deep carmine and reddish-orange. Floral tubes and ovaries are covered with tufts of bristles and hairs. The fruits are oblong, red, splitting at the base upon ripening and containing small black seeds. Flowering occurs in spring or summer, most often after a cool dormancy period.

Eriosyce aurata is a very large and spiny barrel-shaped cactus with numerous ribs. The globose stem with abundant white wool at the top reaches 50 cm (20 in) in diameter. Mature specimens become columnar, reaching over 90 cm (35 in) in height. There are about 30-35 ribs. The spine coloration varies from yellow and amber to reddish-brown or almost black. Young plants have one central spine and 8 radial ones, but their number increases with age, and on mature specimens there can be more than 20 spines on the areoles.

Red bell-shaped or funnel-shaped flowers with a white hairy tube 5 cm (2 in) long are located near the apex of the plant. A mature specimen can have more than 50 flowers. Heavily spiny elongated fruits, upon drying, open via a basal pore. The seeds are rather large, matte, black with pits.

Before sowing, soaking seeds in warm water for 12–24 hours is recommended. Sowing is performed superficially onto a sandy-mineral substrate, lightly pressing seeds into the soil without burying. Containers are covered with a transparent lid or glass and placed in a warm, bright spot at a temperature of 22–26 °C (72–79 °F).

Seedlings appear after 15–25 days; the maximum possible germination period can exceed 40 days. After the first areoles and spine buds appear, pricking out is performed. Young plants grow slowly, so watering must be very cautious to avoid rotting. Over time, dense, beautifully pubescent globes with distinct ribs are formed.

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For growing indoors, bright sunny lighting is used, preferably a south or southwest window, where the plant receives at least 5–6 hours of direct sun rays a day. In spring, it is accustomed to the sun gradually to avoid burns. On hot summer days, light shading during midday hours is recommended. With insufficient light, the stem stretches and loses its compact form. In summer, the plant can be taken out to a balcony or into the garden, protecting it from heavy rains and providing good ventilation.

During the warm season, a temperature of 20–28 °C (68–82 °F) is maintained; the plant tolerates heat up to 35 °C (95 °F) with adequate air access. In winter, a dormancy period at 8–12 °C (46–54 °F) and dry keeping is necessary - this stimulates spring flowering. In summer, watering is performed after complete drying of the substrate; in winter, it is reduced to rare moistening no more than once a month. The plant easily tolerates dry air, requiring no misting.

A mineral, loose substrate with excellent drainage is used, consisting of coarse sand, perlite, pumice, and a small amount of leaf mold (ratio 4:2:1:1). A wide and shallow pot is chosen, with a mandatory drainage hole. Repotting is carried out in spring every 3–4 years, after growth begins; watering is resumed after 7–10 days. Young plants can be repotted more frequently - once every 1–2 years.

During the period of active growth, fertilizers for cacti with low nitrogen content are applied once every 6–8 weeks. In autumn and winter, feedings are not used. Crown shaping is not required: the plant retains its natural globose shape. Propagation is carried out primarily by seeds, occasionally by offsets or grafting onto hardy rootstocks.