Gymnocalycium horstii
Native range: Western Central South America
Known names: N/A
Hardiness: Best to avoid freeze.
Mature Size: Grows slowly to ~8" diameter
Light: Direct sun, Half day sun- avoid hot afternoon sun. 
Water: Water during summer (let soil dry out completely), keep dry during winter.
Soil: Cactus/Succulent mix
Dormancy Period: Winter
Pet-Safe: No
Plant Size: Grown in 2" pot, shipped semi bare root
 
Plump green cactus with 3-5ish ridges. Light yellow spines that curves backwards. forms a clump over time. Pale pink flowers. Found in the grassland of South America. Not a desert cactus so avoid hot burning sun.