Carnegiea gigantea

 Carnegiea gigantea (saguaro)

 Cactaceae

  • After ten years of the slow-growing saguaro is still only four inches high, and it takes more than a hundred years to reach maturity. Then the plant may live to a ripe old age of 250 years.
  • The saguaro is the largest of all North American cacti. They begin their growth in the shade of another plant, growing very slowly at first; it takes 25 years for the plant to reach a height of 2 feet. At 50 years the saguaro is 6 feet high. The first arms develop when the plant is 75 years old. Most saguaros reach a height of 35 feet by the time they are a hundred years of age. Some very old specimens have had as many as 50 arms.

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