Gray Ghost Cactus Organ Pipe Succulent , Pitayo, Pitaya of October Meixcan Cactus/Cacti

Tis cactus comes from Central and South America, in particular to Mexico. Their habitat usually consists in the sunniest parts of rocky cliffs, in arid lands, when they form populations of more or less branched individuals. Some species, instead, tend to be more solitary.

They are columnar or creeping cacti, not so branched, with a stem divided into a few very pronounced ribs (usually just four, or five). The stem can be blue-green or bright green, sometimes with red tinges, while the spines are usually short and sharp.
A beautiful attribute of this genus is also the arrangement of the thorns on the stem. Usually, there are 4-5 spines in each areole, arranged in a star-shaped group. Areoles are neatly lined on the surface of the ribs and are marked, small, white buttons, while thorns are usually white, occasionally tinged in orange, black or red. The size can be very different depending on the species.

Flowers are another reason why this genus is so sought after among cacti lovers: they appear along the sides of the stem in the upper part of the plant. They are bell-shaped, large, with rather short petals, and open during the day.