When planning to fell a tree with a significant lean, what must be carefully assessed?

Carefully assessing the tree’s lean and any faults is crucial when planning to fell a tree with a significant lean because these factors directly impact the tree's stability and fall direction. A tree that leans may be more prone to unexpected behavior during felling, such as rolling or breaking at the trunk, especially if there are any weaknesses or defects present, such as rot or cracks.

Understanding the lean helps in determining the safest and most effective cutting technique. It informs the arborist of the direction in which the tree is likely to fall, allowing for better planning and the establishment of escape routes to ensure safety. By thoroughly evaluating these aspects, the arborist can preemptively address potential hazards and make strategic decisions about how to mitigate risks associated with felling the tree.