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It was a perfectly healthy tree in Clairemont

It might have been the right thing for the wrong reason. The tree was obviously not properly maintained during most of its life; it was leaning and bending, apparently due to indifference or ignorance of proper tree maintenance principles. It may have been chopped off (improper practice) by the power company because of the supply cable extending from the power pole across the street to the house at 4982 Mt. Frissell Drive. Additionally, root pruning weakens the tree's anchoring roots. There are not many places in the Clairemont Mesa area that are suitable for the planting of trees that can grow large enough to kill people when they fall. Many soils are stratified with "hardpan" near enough to the surface to prevent the development of a healthy anchoring root system. The rupture of sidewalks is an indicator that the roots are not developing deeply enough. This is most commonly caused by two management errors--failing to make sure that the soil is deep enough for the proper development of a strong anchoring root system, and failing to insure that the tree's root system is watered deeply enough for such a system to develop. I suspect that it had all these factors against it. The new tree could develop similar problems. The City, not the homeowner, should first make a determination that the soil depth is adequate for the development of a strong support system. If the City is going to require that the adjacent homeowner is responsible for properly pruning as well as irrigating and fertilizing, they should provide exact instructions. Unfortunately, many so-called professionals know little more than inherited folklore about trees, much of it not only wrong, but potentially (if not certainly) dangerous. Trees are wonderful forms of life, but humans seem to believe that they somehow miraculously can take care of themselves despite the abuse they suffer at the hands of humans.
— July 28, 2016 9:58 p.m.

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