An adult welwitschia consists of two leaves, a stem base and roots. That is all! Its two permanent leaves are unique in the plant kingdom. They are the original leaves from when the plant was a seedling, and they just continue to grow and are never shed. They are leathery, broad, strap-shaped and they lie on the ground becoming torn to ribbons and tattered with age. The stem is low, woody, hollowed-out, obconical in shape and sturdy.
Growth occurs annually during the summer months.
Carbon dating tells us that on average, welwitschias are 500-600 years old, although some of the larger specimens are thought to be 2000 years old. Their estimated lifespan is 400 to 1500 years.
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