Trees are limited in size by available resources. Trees will only continue to grow to a size where enough water, sunlight, and air are available to sustain that size. The major limiting factor is water. Water in the ground that is pulled up by the roots has to battle gravity on the way up; if the plant’s water vessels aren’t strong enough, they can become stressed and break.
Trees are somewhat like people: they require plenty of nutrients and nourishment to continue growing. Trees that get more nutrients will grow larger. But the larger a tree gets, the more energy it requires just to sustain itself.
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