Echinopsis pachanoi. Common Name: San Pedro Cactus. Syn. Trichocereus pachanoi. This is a fast-growing columnar cactus with fleshy stems that is widely grown as an ornamental cactus. Native to South America (Peru, Bolivia, Chile and Ecuador) but commonly cultivated in many other parts of the world. It is night-blooming with big white flowers and is a robust and hardy plant that will need plenty of space. It is easy to grow from seeds.