The Saguaro cactus stores large amounts of water in its thick, pleated stems, allowing it to survive long droughts in the Sonoran Desert.

The Saguaro cactus (Carnegiea gigantea) has a ribbed, expandable stem that can absorb and store thousands of liters of water during rainy periods. This stored water sustains the plant through extended dry spells. Additionally, its shallow but widespread root system helps it quickly absorb moisture from light rains. The waxy outer skin reduces water loss, while its spines provide shade and deter herbivores. These adaptations make the Saguaro a keystone species, supporting desert wildlife with food, shelter, and water.