This is an extremely slow growing and one of the nicest Gymnocalyciums species. It has incredibly strong curved spines. If you only have one Gymnocalycium, this is the one to have!

Description: Solitary, slowly growing cactus, densely covered with incredibly strong twisted spines
Blooming season: They will bloom at an early age and bloom sparingly in mid-summer.
Cultivation: Keep this plant almost dry in winter at a minimum temperature of 0°C. It prefers a low pH compost; otherwise growth will stop altogether. The plant tolerates extremely bright situations.

Recommended Temperature zone: USDA: 9-11
Frost Tolerance: 20°F (-7°C)
Minimum Avg. Temperature: 50°F (10°C)
Sun Exposure: Light shade to full sun
Origin: Bolivia (Tarija)
Growth Habits: Solitary, globular, slowly growing up to 5"(12 cm)
Watering Needs: Summer grower, water regularly in summer, keep rather dry in winter
Propagation: Seeds

Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz

Bloom Season	Mid summer
Bloom Season	Summer
Botanical Name	Gymnocalycium cardenasianum
Botanical Name	Trichocereus bridgesii
Common Name	Bolivian torch cactus, Achuma, Wachuma
Dormancy	Winter
Family	Cactaceae
Flower Color	Pinkish
Flower Color	White
Genus	Trichocereus
Growth Habit	Columnar
Growth Habit	Globose
Growth Rate	Fast
Hardiness Zone	8, 9, 10, 11
Mature Size	16 ft. tall
Mature Size	45"
Native Area	Bolivia
Plant Type	Perennial cactus
Propagation	By cutting, seeds
Resistance	5° c
Resistance	Drought tolerant, heat resistant, deer resistant, mild frost tolerant, pest resistant
Soil PH	6.5, Acidic, Neutral
Soil Type	specialized potting mix
Special Features	Easy to maintain
Sun Exposure	Full sun, partial shade
Toxicity	Safe for humans, friendly to cats, friendly to dogs
Watering Needs	Low