Plant Ice Resistant Trees
Winter storms that coat everything in layers of luminous ice leave a beautiful but dangerous calling card. We know ice-covered trees are susceptible to breakage from the added weight. But if you take a look around your yard, how do you know which of your trees are more likely to give in to the devastation of ice layers?
“There are a number of growth features that increase a tree species’ susceptibility to breakage in ice storms,” says Tchukki Andersen, BCMA, CTSP* and staff arborist with the Tree Care Industry Association. “Among them are included bark, decaying or dead branches, the increased surface area of lateral (side) branches, broad crowns or imbalanced crowns, and small branch size.”
Included bark results from in-grown bark in branch junctions. This is a weak connection and increases the likelihood of branch breakage under ice-loading conditions. “For example,” says Andersen, “Bradford pear branches are known to break during ice storms; this is because they commonly have included bark in branch junctions. In contrast, the Aristocrat pear has few branches with included bark and sustains less damage during ice storms.”
Reasons for Breaking
Decaying or dead branches are already weakened and have a high probability of breaking when loaded with ice. The surface area of lateral branches increases as the number of branches and the broadness of the crown increase. With an increased surface area, more ice can accumulate on lateral branches; the greater ice load results in a greater chance of branch failure.
Many broad-leafed tree species, when grown in the open, form broad crowns (decurrent branching), increasing their susceptibility to ice storms. Examples include Siberian elm, American elm, hackberry, green ash, and honey locust. Trees with imbalanced crowns are also more susceptible to ice damage. Generally, though, susceptibility can vary greatly depending on the time of year, geographic location and overall health of the tree.
Management and prevention of ice-storm damage: Plan, then plant
Think about your future. When planting a new tree in your yard, you should have a clear understanding of the size that the tree is expected to grow. Will it grow too close to the house? The overhead wires? The sidewalk? Proper tree placement, away from structures, will reduce property damage. Trees should not be planted in locations where growth will interfere with above-ground utilities – branches that grow into power lines and fail during ice storms create power outages and safety hazards. Trees pruned regularly from a young age should be more resistant to ice storms as a result of the removal of structurally weak branches, the decreased surface area of lateral branches and decreased wind resistance. Professional arborists can install cables and braces to increase a tree’s tolerance to ice accumulation in situations where individual trees must be stabilized to prevent their failure.
After storm damage has occurred, hazardous trees and branches require immediate removal to ensure safety and prevent additional property damage. Trees that can be saved should have broken branches properly pruned to the branch collar. Do not leave stubs or use flush-cut pruning – which results in weakly attached branch sprouts growing back. Poor pruning practices such as these also invite future insect and disease problems. Cut back loose bark only to where it is solidly attached to the tree. A split fork often can be repaired through cabling and bracing.
Tree species resistant to ice damage can be planted to reduce tree and property damage from ice storms.
Find a professional
A professional arborist can assess your landscape and work with you to determine the best trees and shrubs to plant for your existing landscape. Use the Find a Tree Care Company tool to search for a qualified arborist in your area.
I agree with your opinion on planning and then planting the trees. By doing this it will really help to prevent the ice-storm damages. I think I came across this at the right time as we recently purchased a new property and we are planning to plant new trees. I was unaware of the tree pruning concept hence now I will prune the trees at regular intervals to avoid any mishaps.
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This is so important if you live in a cold environment. I own a tree company in Stamford CT – https://www.treecarestamford.com – and we get tons of ice and snow. We always recommend planting ice resistant trees.
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Planting trees that is ice resistant is important, if there are snow fall your house will not be affected by it because of trees.
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