Pack Size: 20, 100, 300
Year: 2026
Accepted Scientific Name: Gymnocalycium neuhuberi H.Till & W.Till
Origin and Habitat:
Gymnocalycium neuhuberi is a rare cactus species native to San Luis Province in central Argentina, particularly near Suyuque Nuevo and Suyuque Viejo on the southwestern slopes of the Sierra de San Luis. It inhabits dry, rocky grasslands at elevations of approximately 800–1,550 metres, growing among granite outcrops, gravel, and sparse vegetation. These environments experience warm summers, cool winters, and seasonal rainfall followed by extended dry periods. Plants are adapted to well-drained, mineral-rich soils and often grow partially sheltered by surrounding grasses and rocks. The species has a restricted natural distribution and is valued by collectors for its distinctive spination and attractive purple flowers.
Description:
Gymnocalycium neuhuberi is a slow-growing, solitary cactus characterized by its globular to slightly flattened shape and grey-green to dark green epidermis. Mature plants typically reach approximately 2–4" in diameter and 1.5–3" tall, occasionally becoming more elongated with age. The body develops prominent, rounded ribs divided into distinct chin-like tubercles. Each areole produces several stiff, needle-like spines, initially yellowish to pale brown, becoming grey with age. The radial spines are generally straight to slightly curved, with stronger central spines developing on mature specimens. Plants produce attractive, funnel-shaped flowers approximately 1–1.5" across, displaying delicate lavender-pink to light purple petals with slightly darker central markings. Flowers emerge near the crown during spring and summer, followed by small, dark green fruits containing numerous seeds. Its compact growth habit, pronounced spination, and colourful flowers make it a desirable addition to specialist cactus collections.
Cultivation:
Zone: 9–11; protect from prolonged frost and excessive winter moisture.
Temperature: Optimal growth at 18–28 °C. Maintain winter temperatures above 5 °C for reliable cultivation.
Growth Rate: Slow, gradually developing a compact, globular body with increasingly prominent ribs and spines.
Soil: A highly mineral, fast-draining cactus mixture containing pumice, fine gravel, crushed granite, and a small proportion of organic matter. Excellent drainage is essential for healthy root development.
Watering: Water thoroughly during active growth, allowing the growing medium to dry between waterings. Reduce watering significantly during autumn and keep mostly dry during winter dormancy.
Fertilizing: Apply a diluted, low-nitrogen cactus fertilizer every 2–3 weeks during active growth. Discontinue feeding during winter.
Light: Bright light with several hours of gentle morning sunlight. Provide protection from intense afternoon sunlight during extreme heat, particularly for young plants.
Pests and Diseases: Susceptible to mealybugs, root mealybugs, spider mites, scale insects, and root rot associated with excessive moisture or poorly draining growing media.
Germination Info:
Temperature: 27 °C.
Surface Sown: Yes. Sow seeds on the surface of a fine, sterilized cactus growing medium and press lightly into place without burying deeply.
Germination Time: Approximately 7–28 days under favourable conditions, although some seeds may require longer.
Moisture: Maintain consistent surface moisture and high humidity during germination, avoiding waterlogged conditions.
Light: Bright, indirect light. Avoid direct sunlight on covered seed trays.
After Germination: Gradually increase ventilation as seedlings establish. Maintain moderate moisture until young plants develop stronger root systems and begin producing characteristic ribs and spines.
