(This plant comes in a 3.5" pot. You will receive a very similar plant to the one in the picture. It may or may not be blooming at the time of your purchase. The plant is shipped in its pot to prevent any damage to the roots).
Notocactus buiningi is one of the most distinctive Notocacti with a unique bright emerald green body, with many sharp ribs and large yellow flowers that open during the day and close at night .This cactus is a pretty easy plant to cultivate. It is good to keep moderately cool, and can also tolerate a light frost.
Recommended temperature zone: USDA: 9b-11
Frost tolerance: Only light frost
Sun exposure: Light shade
Origin: Southern Brazil, northern Uruguay
Growth habits: Solitary, flattened cactus, 3" tall (8 cm), 5" in diameter (12.5 cm)
Watering needs: Regular water in summer. Keep rather dry in winter, rot easily if the substrate is wet and cold, tends to lose its roots in winter.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz