It does not matter how moist the soil is, if it is frozen the roots cannot access that soil moisture. If the soil freezes deeper than the roots go, it cuts the roots off from soil moisture. In fact, a tree or shrub that has suffered drought stress will always do worse in the winter than one who has been kept moist.Įvergreen trees and shrubs older than 2 years old should have roots that go deep in the soil. If, at any point in the year, there has been dry weather, the tree enters the winter with drought stress. Roots cannot draw up water is the soil is too dry. There are several reasons why a tree or shrub cannot draw up as much water as it loses. When the roots cannot draw up as much moisture as the tree lets out, winter burn occurs. This water has to be replaced with water the roots draw up into the tree. Understanding the problem can help you prevent it.Įven in the dead of winter, the stomates, or pores of the evergreen tree or shrub let some water out of the needle or leaf. Worse, the symptoms usually do not show until spring growth begins. Some trees, such as the one above, die entirely. In a bad case, entire branches can turn brown and die. The damage ranges from brown, dry needle tips and leaf edges to the reddening of entire needles and leaves. Winter burn is caused when an evergreen tree or shrub loses more water than it can take in. Preventing Evergreen Winter Burn on Your Evergreen Trees and Shrubs This evergreen shrub died from winter burn
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