Every summer thousands of Tucsonans visit the gardens at Tohono Chul to catch a glimpse of the majesty and beauty of the Queen of the Night, the night-blooming cereus Peniocereus greggii. When the summer heat begins to build, the buds of the Sonoran Desert native night-blooming cereus begin to appear. After a period of start-and-stop growth, the buds blossom in a mass blooming on one night.