— — the brief week the cactus opens after dark.
“The saguaro bloom is a night season. White waxy flowers open after sunset for a few weeks in May, ring the tops of trunks and arms, and close by the following afternoon. Long-nosed bats are the main night pollinators; doves and bees take what's left in the morning. The window is short and weather-dependent, shifting earlier or later with winter rainfall. A cactus must be roughly 35 years old before it flowers at all, which makes each bloom a quiet measure of a desert that runs on much longer time. from the studio
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The saguaro (Carnegiea gigantea) is native to the Sonoran Desert of southern Arizona, a small corner of southeastern California, and the Mexican state of Sonora. Saguaro National Park, with units flanking Tucson, protects two of the densest stands in the United States. The saguaro flower has been Arizona's state flower since 1931. Mature plants reach above 40 feet and live more than 150 years, though they flower only after about 35 years of growth and add their first arm somewhere around 50 to 75 years old, depending on conditions.
Bloom typically runs from late April through June, with the densest opening in May. Each individual flower opens after sunset and closes by mid-afternoon the next day, less than 24 hours from open to close. A mature saguaro may produce more than 100 flowers across the season, but only a handful open per night, distributed around the crown. The window shifts year to year with winter rainfall and spring temperature, which is why local visitor centers publish bloom updates each spring rather than fixed dates.
May through early June is the window for the bloom. Saguaro National Park's east and west districts outside Tucson, the Arizona-Sonora Desert Museum, and the Desert Botanical Garden in Phoenix all carry signage and updates on bloom progression. Daytime highs already pass 90°F in May; mornings before 9 AM are the workable time for short walks. Flowers that opened the night before remain visible until early afternoon. A Tonto Pass or park entrance fee applies depending on the unit chosen for the visit.