Which desert is the only desert in the world where the "Saguaro" cactus grows indigenously?

The story behind the answer

The Sonoran Desert is the only place where the saguaro cactus (Carnegiea gigantea) grows naturally. This desert’s unique mix of mild, mostly frost-free winters and bimodal rains (winter storms plus summer monsoons) lets saguaros germinate and survive. They often start life in the shade of “nurse trees” like palo verde or mesquite and can live for 150–200 years, becoming the iconic, many-armed giants of the American Southwest.

Other deserts lack this precise climate recipe—some are too cold in winter (e.g., Gobi) or have different rainfall patterns (e.g., Arabian). Remember it with the “S–S” link: Saguaro–Sonoran. Bonus fact: the saguaro’s white blossom is Arizona’s state flower, and the cactus provides nesting sites and food for birds like Gila woodpeckers and gilded flickers.