genus comprising 10-12 species of columnar cacti originating in Central America. They are very long-lived and the centenary specimens, in nature, can reach considerable dimensions, even close to twenty meters in height, despite being very slow growth. The stem is dark green, sometimes bluish or grayish; they have 10-15 ribs, covered with areolas which carry numerous gray spines; with age they tend to branch a lot, taking on the appearance of a "bush", while young specimens usually have a single stem. In late spring they produce numerous white or green flowers, followed by fleshy fruits covered with thorns; numerous reddish black seeds can be found in the reddish or pinkish flesh. Over the years, plants tend to lose their thorns and signify the lower part of the trunk. The most widespread species is P. pringlei.
the best position to grow a Pachycereus and certainly full sun, even if the plant does not present problems even in slightly shaded positions for a few hours of the day. It does not fear the cold, therefore in the winter it must be hospitalized in the house or in a cold greenhouse, or in any case in places where the temperature does not drop below 7-10 ° C. Very large specimens can endure short periods of frost.