(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).
This beautiful cactus is one of the most cultivated of all large columnar cacti. They generate very long spines and produce flowers which are white, opening at night and remaining open during the day.
Recommended temperature zone: Sunset: 12-13, USDA: 9-11
Frost tolerance: Hardy to 18°F (-8°C)
Minimum avg. temperature: 50°F (10°C)
Sun exposure: Full sun
Origin: Low deserts of Argentina, Bolivia
Growth habits: Branching cactus to 30" tall (9 m), each columnar stem is 4" in diameter (10 cm)
Watering needs: Regular water in summer for optimal growth
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz