What role does heartwood play in a tree?

Heartwood plays a crucial role in providing structural support to a tree. As trees age, the inner wood, known as heartwood, becomes denser and contributes significantly to the strength and stability of the trunk. This density results from the accumulation of various substances, including resins, that reinforce the wood and help to prevent decay.

In contrast, while leaves are responsible for photosynthesis and new leaves are created in the outer growth areas, these processes are not functions of heartwood. Additionally, heartwood is not primarily involved in water storage; that function is typically managed by the sapwood, the outer layer of the wood, which transports water and nutrients from the roots to the leaves. Understanding the functions of heartwood highlights its importance in ensuring the longevity and durability of trees in their natural environment.