The night-blooming Cereus, the native Arizona kind, typically blooms only one day a year. When I say, one day a year, I mean one day, all around town, the same day. It does not vary except what day that is. When I first moved here, I was cleaning up Buddy's tootsie rolls, I came across one of the most beautiful flowers I had ever seen. Not to mention the strong honey fragrance that it put out. It was attached to a plant that I would have eventually pulled out, mistaking it for a dead stick. The "root", by the way, is a tuber. Tohono Chul Park celebrates this event every year, keeping a watch for this yearly show.