Astrophytum asterias cv. 'Goryo' (5-Rib)

🌿 The Astrophytum asterias cv. 'Goryo' is a rare cultivar of the beloved sand dollar cactus, a species native to the rocky limestone soils of southern Texas and northeastern Mexico. This particular form is distinguished by its unusual five-rib structure, a genetic variation that sets it apart from the typical eight-ribbed specimens. Belonging to the Cactaceae family, this slow-growing beauty is a challenge for intermediate to advanced growers who appreciate the patience required for rare succulents. What makes this cultivar especially fascinating is that in its natural habitat, Astrophytum asterias grows nearly flush with the ground, camouflaged among stones as a survival adaptation against grazing animals.
FOLIAGE AND GROWTH HABIT
This cultivar grows in a compact, solitary rosette that sits low and wide, resembling a flattened sphere or dome. The body is divided into five pronounced ribs rather than the species' usual eight, creating a strikingly geometric appearance. The surface is spineless and smooth, covered in a dusty green to grey-green skin decorated with white woolly areoles arranged in neat rows along each rib. The texture is firm and waxy, designed to conserve moisture in arid conditions.
FLOWER DETAILS
When mature, this cactus produces stunning daisy-like flowers that emerge from the woolly centre of the plant. The blooms are bright yellow with a vibrant red or orange throat, creating a cheerful contrast against the muted body colour. The flowers carry a light, sweet fragrance and typically appear in spring and early summer. To encourage flowering, the plant needs a proper winter dormancy period with cooler temperatures and reduced watering. Each flower lasts only a few days, but their beauty and rarity make them worth the wait. Flowering typically begins when the plant reaches about four to five years of age.
CARE INSTRUCTIONS
🌞 Light: Bright indirect light or filtered morning sun for 6-8 hours daily. Avoid harsh afternoon sun which can scorch the epidermis.
💧 Water: Water sparingly during growing season (spring to fall) when soil is completely dry, roughly every 2-3 weeks. In winter, water once monthly or less. Use the soak-and-dry method, ensuring water drains completely.
🌡️ Humidity: Low humidity, ideally 30-40%. Thrives in typical dry indoor conditions.
🪴 Soil: Well-draining cactus mix with added pumice or perlite. Gritty, mineral-heavy substrate that mimics limestone habitat.
🏺 Potting: Shallow terracotta or unglazed clay pot with drainage holes. Repot every 3-4 years in early spring. Pot should be slightly wider than the plant body.
🌱 Growth rate: Extremely slow. May grow 1-2 cm per year. Can take 10-15 years to reach mature size of 8-10 cm diameter.
👩‍🌾 Fertilizing: Feed monthly during growing season (April to September) with diluted cactus fertilizer at half strength. No fertilizer in winter.
🐾 Pet friendly: Yes, non-toxic to cats and dogs. Safe for homes with curious pets.
WHERE TO PUT IT
This cactus thrives on sunny windowsills, particularly south or west-facing windows where it can receive ample bright light without direct scorching rays. It's ideal for minimalist displays on desks, shelves, or dedicated cactus collections where its unusual geometry can be appreciated up close. The compact size makes it perfect for small apartments or condos. Avoid placing it in humid rooms like bathrooms or kitchens, and keep it away from cold drafts near windows during Canadian winters.
RARITY ASSESSMENT
rare