It depends on how you define the question. If the question is how long can plants live in an ideal world with no disease, natural disasters, fatal genetic mutations....etc, the answer is plants can live forever. In the real world, that doesn't happen. Old trees eventually get killed by disease or are uprooted. Most orchids don't live beyond 10 years because stuff happen. Hey, when the sun burns out in 5 billion years, all life on earth will be gone.....so, just depends how you want to look at it.
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