Evergreen Shrub Winter Burn
Winter burn, sometimes called "winter scorch" affects evergreen shrubs and
trees with needles (I.e.. pine trees). Winter burn occurs in harsh winters,
evident by a dry, brown, scorched appearance of the leaves or needles. While
all evergreens and needled trees can be get winter burn, Azaleas, Hollies,
and Rhododendrons are highly susceptible.
Winter burn occurs in frigid weather, and is the result of dehydrated plant
tissue, as the frozen ground does not allow the plant's root system to provide
enough water to replace water lost through the leaves or needles.
How Winter Burn Occurs
All plants get energy from the sun through photosynthesis. A byproduct of
photosynthesis, is the release of water through the plant's leaves. This
is called "Transpiration". Extremely cold weather freezes the ground, preventing
the evergreen plant root system from drawing water from the soil to replace
water lost through transpiration. The leaves die, dry out, and appear burned.
Deciduous trees, which shed their leaves each fall, are obviously not susceptible
to winter burn.
Winter sun can be a factor in drying out water starved evergreens.
Wind also results in drying out the leaves, increasing the amount of water
lost through the leaves.
Newly planted trees are more susceptible, especially if planted later in
the growing season, as the root system has not had sufficient time to develop.
How To Minimize Winter Burn Damage:
When planting evergreens, locate them away from windy areas.
Plant evergreens early in the spring, to allow the root system to get well
Apply a thick layer of mulch around plants, to help insulate the soil from
freezing too deeply.
Select native trees and shrubs, that are naturally adapted to local winter
If the soil is dry in the winter, but not frozen, water deeply around the
Use burlap bags to protect evergreens, reducing the affect of wind and sun.
Apply anti-dessicants for evergreens.
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