Haavepuut

Haavepuut, commonly known as "heartwood" in English, refer to the central, often darker, and more durable portion of a tree trunk or branch. Unlike sapwood, which is the outer, lighter layer responsible for transporting water and nutrients, heartwood is typically formed after a tree matures. It consists of dead cells that have filled with resins, gums, and other substances, providing structural support and resistance to decay, pests, and disease.

Heartwood is valued in woodworking and construction due to its strength, stability, and aesthetic appeal. Many commercially important timber species, such as oak, teak, and mahogany, are prized for their distinct heartwood patterns and durability. The color and grain of heartwood can vary significantly depending on the species, environmental conditions, and age of the tree.

In some contexts, particularly in Finnish forestry and wood science, the term *haavepuu* may also refer to the process of identifying and selecting heartwood for milling or processing. Properly distinguishing heartwood from sapwood is essential for ensuring the quality and longevity of wooden products. However, in certain cases, sapwood can also be used, especially in applications where moisture resistance is less critical.

Haavepuut play a crucial role in the lifecycle of trees, contributing to their longevity and resilience. As trees grow, the transition from sapwood to heartwood occurs naturally, marking a shift from active growth to structural reinforcement. This process is influenced by genetic factors, environmental stress, and the tree’s overall health.