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How can the same conifer species grow as a tiny tree in poor soil and a tall tree in rich soil?

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The massive Grizzly Giant sequoia tree stands with a wide, reddish-brown trunk and a hollowed base, surrounded by other tall trees in Mariposa Grove, Yosemite National Park. — Conifer A giant sequoia (*Sequoiadendron giganteum*) estimated to be between 1,900 and 2,400 years old, Grizzly Giant is the oldest tree in the Mariposa Grove, Yosemite National Park, California.

The variation in size for a single conifer species across different environments is primarily due to phenotypic plasticity, which is the capacity of a given genotype to produce different morphological expressions depending on environmental conditions.1

A tree's form is an ecological construct, as its growth is heavily dependent on the stresses and resources available in its habitat. When a conifer grows in poor soil or extreme conditions, its development is constrained by the availability of essential resources such as water, nutrients, and light. Trees respond to these limitations through physiological and morphological adaptations, including the reallocation of available nutrients and water to the organs most in need.1

In contrast, when the same species grows in rich soil with more favorable conditions, it can allocate more resources to growth, allowing it to reach a larger size. Because trees are unable to move to search for resources, they must adapt to the specific constraints of their location, resulting in significant differences in height and structure based on the quality of their environment.1