Many saguaro cactus live for hundreds of years. As they age, their outer coating can become damaged and form scars. The plant continues to grow unless the entire outer layer of the plant is the
soft, water-storage parenchyma tissue is destroyed all the way around the stem of the cactus. As I get older, I can relate to this cactus plant since my skin is beginning to look like this photo (except for the spines).
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