Echinopsis pachanoi is a cactus species commonly known as the Easter lily cactus or San Pedro cactus. It is characterized by its tall, cylindrical shape and cluster of white, trumpet-shaped flowers. Native to the Andes, it holds significant cultural and spiritual value in indigenous rituals involving ayahuasca, where its psychoactive alkaloids induce altered states of consciousness. As a houseplant, it enjoys well-drained soil, ample sunlight, and moderate watering, thriving in USDA hardiness zones 9-11. It shares similarities with species like Echinopsis lageniformis and Trichocereus peruvianus.