Tthe Sulcorebutia rauschii 'viridermis' is a captivating and compact cactus highly sought after by collectors and enthusiasts for its mesmerizing geometric form and vibrant coloration. A rare, green-skinned form of the species Sulcorebutia rauschii, this cultivar is known for its sculptural body, small size, and highly symmetrical arrangement of areoles. Its name, ‘viridermis’, literally means “green skin,” distinguishing it from the more commonly seen deep purple or violet forms of S. rauschii. 

Sulcorebutia rauschii f. viridermis is the botanical name, while Sulcorebutia rauschii cv. Green Apple is a cultivar name often used for marketing or identification purposes. Essentially, they refer to the same plant: a green-bodied form of the Sulcorebutia rauschii.  

Native to Bolivia, the Sulcorebutia rauschii viridermis forms a small, globular to slightly flattened stem, typically grows up to 2 inches wide, though it slowly offsets into attractive clusters over time.

The stem is smooth and bright green, segmented into neat rows of tubercles, each topped with a tight cluster of short, dark, comb-like spines.

These spines are non-aggressive and hug the body, making it safer to handle than many other cacti.

Its tidy growth habit and vivid coloration make it an excellent accent in container gardens or shallow dish planters.

The flowers of Sulcorebutia rauschii viridermis bloom in spring or early summer with large, vivid magenta to purple-pink flowers, often emerging in a ring around the crown of the plant.

The blooms are broad, daisy-like, and provide a stunning contrast against the green skin. Each flower lasts several days, and a well-established cluster can bloom multiple times through the warm season. Flowering is most prolific when the plant experiences a cool, dry rest period in winter, followed by increased light and warmth.

When it comes to care, use a well-drained cactus mix, ideally with added pumice, perlite, or coarse sand to mimic its native rocky substrate. Water deeply but infrequently, let the soil dry completely between waterings. Reduce watering to almost none in winter to encourage dormancy and flowering.

When grown indoors, it prefers bright, indirect sunlight; a south- or west-facing window is ideal.

It can tolerate brief dips to 40°F but should be protected from frost.

When grown outdoors, it thrives in USDA zones 9–11 or kept in containers that can be moved inside during cold weather.

During spring and summer, feed once a year with a diluted, low-nitrogen cactus fertilizer to promote flowering and healthy growth. 

Final Thoughts

Overall, the Sulcorebutia rauschii 'viridermis' is a remarkable addition to any collection. Its brilliant green skin, dark spines, and colorful flowers offer year-round interest, while its compact form and manageable care requirements make it ideal for small spaces and containers. With the right conditions and a little patience, this rare gem will reward growers with a living sculpture that’s as resilient as it is beautiful.