How to deal with storm-damaged trees

Richard Bogren, Gill, Daniel J.

For Release On Or After 09/16 /11

By Dan Gill
LSU AgCenter Horticulturist

September is one of our most active months for tropical storms and hurricanes. Although parishes in the southern portion of the state are most vulnerable, these powerful storms can and do produce high winds and heavy rains as they move north. And tropical storms aren’t all we have to worry about. Violent summer storms can produce high winds and tornados as well.

Trees are particularly vulnerable to the effects of high winds and sustain various types of damage as a result. Much of the work dealing with trees after a hurricane should be done by professionals who have the equipment and training to do the job safely. Most people do not have the equipment or expertise to safely remove large trees or fallen trunks. Also remember that downed power lines are often present around fallen trees, so take necessary precautions.

In Louisiana, the individual or company you hire to do tree work must be licensed by the Louisiana Department of Agriculture and Forestry and carry proper insurance. To find licensed arborist in your area or to check on a company you are thinking about using, go to the Louisiana Department of Agriculture website at and click on Find a Licensed Horticultural Professional.

After a storm, you should have fallen trees removed as soon as it is practical (obviously, trees that fall on or near the house get top priority). If you want the stumps ground out, you need to check with the company removing the trees. The ground-up wood left from the stump grinding (and also ground-up branches) may be used as mulch in planting beds, for covering walkways or composted for use as a soil amendment during bed preparation.

Homeowners can handle smaller trees and branches with chainsaws. This may be necessary to clear pathways or driveways or remove branches around a home. It is critical that you understand the safe use of such equipment and follow the manufacturer’s safety precautions carefully. Read user instructions thoroughly and do not attempt to tackle jobs that are beyond your ability to carry out safely.

If you have damaged trees, remove large branches that are broken but still hanging. These branches pose a significant risk because they can fall at any time. This should be taken care of as soon as possible. Less critical are broken stubs where branches were lost. These stubs, however, should eventually be pruned off to allow the trees to heal over the wounds. Make the final pruning cut just outside of the branch collar at the base of the branch.

You can remove older trees that are so badly damaged they cannot be saved or those that are significantly leaning. Unless a tree appears to be leaning so far that it poses a hazard of falling, these jobs can be put off for a short time.

Young trees planted within the past few years are often blown over by high winds or may be leaning. These trees, generally less than 10 inches in diameter and planted within about seven years, should be saved. Straighten them as soon as possible, and they will usually survive and recover. If the roots are exposed, cover them with soil or mulch to keep them moist until you get a chance to straighten the tree.

Newly reset trees will need to be supported until they reestablish a strong, new root system. This can be done with stakes or guy lines, depending on the size of the tree and the situation. Leave the support in place for about nine to 12 months. Limited pruning may be done at the time of resetting to remove damaged branches and to lighten the weight of the canopy, but do not prune excessively. It is generally not practical to straighten larger, more mature trees that have blown over.

Many larger trees that are wind-damaged but remain upright can be salvaged, depending on how much damage was done to the canopy and on the species of the tree. Do not be concerned if the trees were stripped of foliage – something that may happen in the high winds of hurricanes and tornados. The leaves will grow back. Focus more on damage done to the branch structure. Loss of or severe damage to most of the main branches likely means the tree should be removed. This would be particularly true for brittle-wooded species such as pecan, pine, maple or hackberry. Trees that only lose secondary branches and few or no major branches can generally be pruned and saved.

Evaluating standing trees to determine if they need to be removed or can be saved is often best done by a knowledgeable individual. If you have difficulty determining which standing trees could be salvaged, contact a local licensed arborist to look over the trees and help you decide. There is no hurry to make these decisions. It is often advisable to wait until the next spring or summer to see how the tree grows out and recovers before making a final judgment.

Trees are among the most valuable and irreplaceable parts of our landscapes. After storms with high winds move through an area, properly dealing with tree damage primarily involves determining what can be saved and how to do it and what should be removed.

Rick Bogren

8/30/2011 12:57:43 AM
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