Trichocereus pachanoi - San Pedro Cactus
San Pedro Cactus is a fast-growing columnar cactus native to the Peruvian Andes. It's easy to grow and the cluster of tall, slender branches is especially handsome. When conditions are right (usually just after a rainfall), it produces huge fragrant white blossoms at night worth staying awake for.
Native to the Andes, San Pedro tolerates lower temperatures and more rainfall than most cacti. It needs free-draining soil, an occasional deep watering, and some protection from scorching sun in mid-summer. It grows fastest in sunny climates with long summers, is hardy anywhere in zones 8-10.
This is not a very prickly cactus. It has short spines and is safe to plant near a walkway (but maybe not a swimming pool.) Slender and very erect, it makes a handsome statement in most gardens and grows just fine in a pot.