they store water in the needles and their roots are higher up in the ground so they can catch water faster than having to wait for the water to go deep into the ground
The saguaro cactus utilizes a shallow root system to quickly absorb rainwater, a large stem to store water, and has adapted to minimize water loss by lacking leaves. These features enable it to flourish in its arid desert environment. Overall, it is well-equipped to make the most of rare rainfall events.
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