What typically causes tree failure in normal wind speeds?

Tree failure during normal wind speeds is often attributed to unresolved structural defects. These defects can include issues such as cracks, weak branch unions, or heavily leaning trunks. Such conditions compromise the tree's overall stability and resilience, making it more susceptible to failure even under conditions that would typically not pose a threat.

When trees have these structural weaknesses, they might not be able to support their own weight or resist lateral forces effectively, leading to a higher likelihood of breakage or uprooting. This highlights the importance of regular inspections and maintenance to identify and address any structural issues before they lead to more serious failures.

While other factors like disease, excessive pruning, and shallow root systems can contribute to a tree's overall health and stability, they are less commonly the direct cause of failure in normal wind conditions compared to the prevalence of structural defects. For example, while disease can weaken a tree, it usually leads to failure over time rather than suddenly in normal conditions. Similarly, excessive pruning can alter the tree’s weight distribution but typically would not result in immediate failure under normal winds without the presence of significant structural issues.