During the winter snow and cold, it helps to give protection to some kinds of woody plants. This guide is about preventing damage to trees and shrubs in winter.
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A tree's bark acts as a protective barrier in the same way skin protects the human body. It protects the tree's underlying vascular system from insect and animal damage and acts as a buffer to external changes in environmental conditions. Winter can be tough on trees, especially young trees and species with thinner bark. Over time, splits in the bark caused by sunscald can weaken your trees, adversely affecting their development and leaving them more vulnerable to attacks from animals, insects and disease. When properly applied, tree wraps may reduce the incidence of this common winter injury. Here is a look at some different types of tree wraps and how use them appropriately.
Plastic Spirals (Guards): These are easy to put on and take off. They also fit loosely enough to allow for air circulation, while discouraging insects and small animals. Guards are not always tall enough to protect the trunk from soil level to the first set of branches. Should be removed in summer months.
Paper Tape: This is the most common, naturally looking and least expensive option for wrapping trees. Ends can be secured with duct tape or electrical tape. Tape should be removed in the spring and applied again in November. Paper tape may not protect as well against damage from insects or rodents and may not hold up as well to the elements.
"New" Skin: These are biodegradable wraps that will expand as your tree grows. It can be left on for two to three years until it decomposes naturally. These wraps are usually more costly, but may be worth a look if you're only wrapping a few trees.
Aluminum Tape: This material reflects the sunlight on the outside and offers good insulation and temperature moderation on the inside. As with paper tape, secure the ends of aluminum tape with duct tape or electrical tape. Remove it in the spring and reapply it in the fall. Aluminum tape is slightly more costly than paper tape and its reflective properties look unnatural. Heavy duty aluminum foil is a also a good alternative.
White Paint: Professionals who have a lot of trees to cover sometimes use a coat of diluted, white interior latex paint. White paint is highly reflective and interior paint usually contains less harmful chemicals than exterior paint. Paint does have the advantage of easy application and it often lasts for a season or two. The problem is that once it's on, only time can remove it. Many people find that after they apply it, they wish they hadn't. It looks unnatural and it's unclear what the chemical effects are to the tree over time.
Wooden Boards: For simple protection against sunscald, use a soft rope or twine to secure upright boards to the south/southwest side of your tree. This will help protect the bark from sunscald, but will not offer any protection against damage by rodents or insects.
When used incorrectly, tree wraps may not provide the protection originally intended, in fact, they may end up causing more harm than good. If wrapped too tightly or left on too long, wraps can cause serious damage (even death) by girdling or compressing bark tissues and restricting the flow of water and nutrients. They can also invite fungal disease by trapping moisture and inhibit the natural maturation of bark by blocking out sunlight and restricting air circulation. Here are some tips for wrapping trees properly:
Maple, ornamental cherry, dogwood, linden, London plane, elm, horsechestnut, young oak, willow, crabapple, beech, and walnut.
By Ellen Brown
If you live in a climate where winters are severe, you've probably already discovered that the snow and cold weather can cause severe damage to trees and shrubs. And while you can't do anything about the weather, a little bit of planning and preparation can minimize the effects of winter damage on your landscaping.
On cold winter days, the low angle of the winter sun can heat up the bark enough to stimulate cellular activity. During the day, the bark tissue expands from the warmth of the sun, usually on its southwest side. As temperatures drop at sunset, the temperature of the trunk also drops rapidly. This causes elongated cracks or sunken or dried areas in the bark.
Prevention: Smooth or thin-barked trees (cherry, crabapple, honey locust, linden, maple, mountain ash, and several types of fruit trees) and young or newly planted trees are the most susceptible to "sun scald". You can prevent it by wrapping the trunk from the base to the first branch in commercial tree wrap. Plastic guards or other light colored material like white latex paint can also help deflect sunlight, helping the bark maintain a constant temperature.
Evergreen foliage may become bleached or turn brown due to loss of moisture, swings in temperature or the arrival of cold temperatures before trees and shrubs have had time to completely harden off.
Prevention: To minimize moisture loss, evergreens should be watered thoroughly going into late fall and early winter. This supplies roots with the moisture needed to make up what is lost through the foliage on windy days.
Bleaching damage commonly occurs on the southern side of the tree or shrub. If possible, plant them in areas where they are protected from wind and the sudden shifts in temperature due to daytime warming and sunset cooling.
Severe winter temperatures can cause shoot dieback and bud death in deciduous trees and shrubs.
Prevention: There is nothing you can do to guarantee protection from winter dieback, but there are a few measures to take to put the odds in your favor. Keeping plants healthy going into winter will make them less susceptible to cold temperature damage. This means avoiding late summer fertilizing and over watering or pruning. Plants that are not hardy to your climate should be planted in a protected area of your landscaping.
Roots are the last part of the tree or shrub to go dormant in the winter. Soil temperatures are usually warmer than air temperatures because soil cools more slowly than air. Roots are less hardy than stems and branches and can become severely damaged or die at temperatures below 10°F.
Prevention: Moist soil retains moisture longer than dry soil. Watering trees and shrubs well during the fall months will help prevent damaging frost from penetrating the soil to root levels. Mulch thoroughly in the fall to keep soil warm and give trees and shrubs extra time to devote to root growth before winter. Check around newly planted trees and shrubs for cracks in the soil and fill them in with dirt.
Snow and ice can weigh heavily on branches and shrubs, causing them to snap and break.
Prevention: Avoid planting shrubs directly under the eaves of a house, where snow can slide off the roof. Try to prevent snow from accumulating on shrubs and evergreen branches by knocking it off a little at a time during heavy snowfalls. When shoveling, take care not to burden shrubs along sidewalks and driveways by piling on the snow. The branches of small trees and shrubs can be wrapped or tied together and unbound in spring.
Repeated freezing and thawing of soil in the fall or early winter can damage roots and heave newly planted and shrubs and trees right out of the ground.
Prevention: New plantings should be mulched 6 to 8 inches deep to help maintain constant soil temperatures.
Salt used to deice roads and walkways can wreak havoc on nearby roots during spring runoff and can cause damage to evergreen foliage.
Prevention: Avoid planting trees and shrubs near boulevards, driveways, or other highly salted areas, or plant species that are known to be salt tolerant. Ornamental shrubs susceptible to salt spray from passing vehicles can be wrapped in burlap or plant cloth to minimize damage.
By Ellen Brown
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