How To Care for Leaning Trees
There are many reasons that trees can lean. If they are competing for light and space they will often grow towards these resources. Trees which are improperly staked, have structural defects, have grown with a prevailing wind, or have blown over when younger, often exhibit a persistent lean. Usually such trees reinforce themselves by forming extra tissue to support them. It is for this reason that if you look at a cross section of a leaning tree, the middle of the tree will not be in the middle of the cross section. Instead, the tree will have optimized its situation by forming “reaction wood” and “tension wood.” While in some cases they do have a higher chance of failure than a tree would with a straight trunk this is not always true. In many cases if the tree has grown with the lean for many years it likely made the necessary adjustments both in the trunk and canopy to deal with this added stress. These responses are another evidence of the “toughness” of trees. They are adaptable and self-optimize in the face of stress.
Another type of lean which is more problematic is the “recent” lean. If you suddenly notice a new lean in your tree it is time for careful examination. Or, if after a storm you find a crack in the soil between the base of your tree and the surrounding ground you may have a problem. This indicates the tree has shifted. It may also mean that significant structural roots have been broken or damaged.
If you are concerned about your tree’s lean it is wise to consult with a Certified Arborist. If you livein Arizona, I recommed talking with a Phoenix Arizona tree service. Through experience they will be able to help you determine the proper course of action. In some cases it will be best to measure the lean of the tree and then to periodically assess and re-measure to see if it is increasing. In other cases significant pruning or the installation of guy wires or other types of support may be warranted. Sometimes it may be necessary to remove the tree if it has become unstable. By taking action and hiring a Certified Arborist to assess your leaning trees you can mitigate the potential of tree failure, and in many cases preserve trees which are important to you.

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