Echinopsis pachanoi, commonly known as the San Pedro cactus, is a fast-growing cactus native to the Andes mountains in South America. It typically features tall, columnar stems that can reach heights of up to 20 feet and are adorned with spines. The cactus blooms beautiful white or pale pink flowers, which usually open at night and close by morning. This cactus is known for its psychoactive properties due to the presence of mescaline, a naturally occurring hallucinogen. Traditionally, Echinopsis pachanoi has been used in indigenous rituals for spiritual and healing purposes. It thrives in well-drained soil and requires plenty of sunlight, making it a popular choice for gardens and ornamental displays.