First our Navajo man!
Saguaro Fact #4: Life is hard for saguaro seeds, produced by the fruit just in time for the summer rainy season. The seeds need summer rain in their first few months in order to sprout, then a series of seasonal rains for two or three years in order to establish themselves. The plants cannot tolerate freezing temperatures for more than a day and do not grow in areas that receive less than two inches of rain in summer. Good crops of saguaro may come only a few times in a century.