Trees need to be removed for reasons such as unhealthy and diseased trees and trees are in the way of landscape or structures. Sometimes trees are just old and pose a safety hazard.
Property owners and gardeners can know that a tree needs to be removed when trees have dead wood of either multiple branches or the trunk. Dead branches can fall and be a danger to people or at least destructive to property. When a large branch breaks off the main tree and gets lodged within the other branches or if a significant crack is found, the tree should be removed.