Recognizing when trees are hazardous

Trees benefit us in many ways, but it's important to remember they can also cause major damage or grief when limbs, or the whole tree, fall on power lines, houses, cars or people.

In general, it's always a good idea to inspect trees at least annually, particularly older trees which may have accumulated multiple defects or decay or have been topped in the past, and especially before and after storms.

There are specific warning signs we can learn to recognize and watch for. Here are a few:

Trees that lean

Trees don't always grow straight up, but a tree that recently started to lean can have problems. Check for cracked soil or exposed roots around the base of the tree, indicating a tree that has recently begun to lean.

More than one trunk

Some trees develop multiple trunks. Inspect these trees for cracks or splits where the trunks are joined. Splits, cracks, or several branches arising from the same point on the trunk can also become problems. Limbs that are safely attached tend to be "U-shaped" rather than "V-shaped."

Cavities and decay pockets

If there are mushrooms on or near the base of the tree, consult an arborist. Large decay pockets on the tree, or mushrooms or conks growing on or at the base of a tree are signs of decay-causing fungus. A consulting arborist can tell you whether a tree with fungi needs to be removed, pruned or merely monitored.

Hangers and deadwood

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Recognizing when trees are hazardous