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Saguaro cactus flowers after growing 40 to 55 years. Cacti are flowering plants, so every kind of cactus is capable of blooming when it is mature. Whether or not an individual cactus plant blooms depends on its age and the care it gets. Some cacti don't bloom until they are more than 30 years old.aguaro cactus flowers after growing 40 to 55 years. Cacti are flowering plants, so every kind of cactus is capable of blooming when it is mature. Whether or not an individual cactus plant blooms depends on its age and the care it gets. Some cacti don't bloom until they are more than 30 years old.
Identifying Features. The saguaro cactus (Carnegiea gigantea) is one of the defining plants of the Sonoran Desert. These plants are large, tree-like columnar cacti that develop branches (or arms) as they age, although some never grow arms. These arms generally bend upward and can number over 25.Saguaros are covered with protective spines, white flowers in the late spring, and red fruit in summer.hese plants are large, tree-like columnar cacti that develop branches (or arms) as they age, although some never grow arms. These arms generally bend upward and can number over 25. Saguaros are covered with protective spines, white flowers in the late spring, and red fruit in summer.