Cereus is a genus of cacti known for their tall, columnar shapes and vibrant flowers. These plants are native to the Americas, particularly in arid regions, and can grow several feet high. They thrive in dry environments and are often found in deserts, where they have adapted to conserve water. The flowers of Cereus are typically large and can bloom at night, attracting nocturnal pollinators like bats and moths. Some species, such as Cereus peruvianus, are popular in cultivation for their striking appearance and ability to withstand drought, making them suitable for gardens and indoor settings.