Dozens of night-blooming cereus had their one night in the spotlight, opening just after sunset at Tohono Chul Park north of Tucson on July 13, 2019. It's an annual event. Grounds manager Lee Mason checks on the buds at the start of Monsoon Season and sends out daily updates, adjusting time estimates for the big night. The beautiful flowers come in a variety of pastel colors, but only open at night.

Tohono Chul Park the largest private collection of cereus cactus in the world, according to Michelle Armstrong, marketing director.