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A new cactus takes about 15 years to grow to the height of one foot, which is when they begin to bloom; they can take 40 years to reach 10 feet. Saguaro cactus continue growing until they’re about 100 years old, reaching a standard height of 20-30 feet, with a few as large as 40-50 feet. The lifespan of this plant is approximately 200 years.
