Trichocereus pachanoi "San Pedro" with 8-inch bloom

It's a little unfair comparing the 8-inch flower on this large-growing Trichocereus pachanoi with blooms on smaller plants. Fair or not, this flower makes one of the most stunning entrances of any cactus flower. Unlike some less spectacular blooms, it lasts just about a day. (I'm grateful for even that time--some excellent cacti open their flowers at night, only to fade before the next day.)

San Pedro is an ethnobotanical with a long history of use in religious ceremonies. And it makes a lovely plant in the landscape or... somewhat improbably... in a container like this 8" clay pot.