Euphorbia heptagona

Euphorbia heptagona is an easy-to-grow, deep green, cylindrical plant, very sparsely spined and about 1/2-inch in diameter. It is a suckering and branching plant about 6 to 10 inches tall with tiny leaves down the ridges of the top inch or so of each column (5 to 7 ridges per column).

Cold hardy to about 25°F.

Grows best if located sunny with a temperature minimum of 12°C. Allow the soil to dry out between the waterings.

Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz