Pachycereus
Pachycereus is a genus of large, columnar cacti native to arid and semi-arid regions of Mexico and the southwestern United States. These impressive, long-lived succulents are part of the Cactaceae family and are adapted to extreme desert climates, with thick, water-storing stems and deeply ribbed surfaces. Most species in this genus can reach towering heights of up to 30 feet (9 meters) and are commonly found growing in rocky, well-drained soils. Their spiny exteriors offer protection from herbivores, while their shallow but wide-spreading roots efficiently absorb scarce moisture. Pachycereus species are known for their large, often fragrant nocturnal flowers, typically pollinated by bats or moths. In cultivation, they are prized for their sculptural form, drought tolerance, and longevity, making them a dramatic addition to xeriscapes and desert gardens.