Pack Size: 20, 100, 300
Year: 2026
Accepted Scientific Name: Gymnocalycium baldianum (Speg.) Speg.
Origin and Habitat:
Gymnocalycium baldianum is an attractive cactus species native to northwestern Argentina, particularly the mountainous regions of Catamarca Province. It inhabits rocky hillsides, open grasslands, and dry mountain slopes at elevations ranging from approximately 500–2,000 metres. Plants grow in well-drained, mineral-rich soils, frequently among grasses, rocks, and low-growing vegetation that provide partial protection from intense sunlight. These environments experience warm summers, cool winters, and seasonal rainfall followed by extended dry periods. The species is well adapted to mountainous conditions and is particularly valued for its compact growth habit and unusually vibrant red flowers, which distinguish it from many other members of the genus.
Description:
Gymnocalycium baldianum, commonly known as the Dwarf Chin Cactus or Spider Cactus, is a compact, slow-growing cactus characterized by its flattened, globular shape and attractive dark grey-green to blue-green epidermis. Mature plants typically reach approximately 1.5–4" tall and 2.5–3.5" in diameter, generally remaining solitary but occasionally producing offsets with age. The body develops 8–10 broad, rounded ribs divided into prominent chin-like tubercles. Each areole produces approximately 5–7 short, slender, slightly curved spines, ranging from pale grey to brownish-grey, typically lying close against the plant's surface. Mature specimens produce striking, funnel-shaped flowers approximately 1.5–2.5" across, displaying brilliant crimson-red, deep magenta, or reddish-purple petals with contrasting yellow stamens. Flowers emerge near the crown during spring and summer, often appearing repeatedly throughout the growing season. Its compact form and colourful flowers make it a desirable addition to 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 to moderate, gradually developing a compact, flattened, globular body with prominent ribs and short spines.
Soil: A fast-draining cactus mixture containing pumice, fine gravel, and a moderate 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 to partial sun. Gentle morning sunlight encourages compact growth and abundant flowering. Protect from intense afternoon sunlight, particularly during hot summer weather.
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.
