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| Magnolia in Snow |
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| Magnolia in Snow |
Winter cold and winds can be harsh on your landscape. Evergreen trees and shrubs maintain foliage throughout the winter months where they continue to lose moisture. With winter temperature fluctuations, moisture loss and the ground still frozen, transpiration occurs from the needles and leaves increasing water demand. If the roots cannot keep up with these demands the needles and leaves start to turn brown and die. Winter burn or desiccation is a dehydration of the plant due to water loss from the leaves through transpiration. This is caused by long dry periods of cold and thaw along with winter winds. Some broadleaf evergreens such as holly, rhododendron, cherry laurel, skip laurel, mountain laurel, Japanese skimmia, leucothoe, aucuba and boxwood are even more susceptible to winter drying and long-term damage. An easy way of avoiding winter damage to plants is to apply an anti-desiccant spray to the upper and lower parts of the foliage before the temperatures drop below freezing or during a winter thaw.
WHEN TO APPLY: Apply anti-desiccant when the daytime temperatures start falling below 50 degrees (late fall/early winter). Apply when the temperatures are above freezing and there is no threat of rain or frost within 24 hours. (This tip applies to areas going into their winter season-temperatures dropping below freezing: 0 degrees Celsius or 32 degrees Fahrenheit.) Anti-desiccants are organic and break down under heat and light so it is recommended to spray again in late winter.