Winter browning results from the interaction of injurious minimum temperatures, frequent freeze/thaw cycles, and rapid cooling and thawing rates. These conditions are more apt to be found on portions of the plant that intercept the most sunlight during the winter months, and explains why "browning" or "burning" is usually noticed on the south or southwest sides of evergreens. Therefore, the key to reducing this type of injury is to minimize foliar temperature extremes for injury-prone plants. Planting sensitive species in sheltered locations, providing tough companion plants like spruce to shield tender plants, or screening plants with burlap or snow fence can help prevent unsightly foliar browning. Landscape managers and homeowners should avoid the temptation to prune browned areas from evergreen trees and shrubs in early spring since these branches may still have viable buds that will produce new foliage when growth resumes.
This article originally appeared in the March 15, 1996 issue, p. 25.
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