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.
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.
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.