As we prepare for the winter months there are a few important things to think about concerning tree care.  One of the most important considerations for the harsh winters that we face in the Midwest is winter damage on the evergreen trees.  Evergreens are a beautiful addition to many landscapes across the area and nothing is more frustrating than losing an old evergreen tree from winter damage.  Winter damage is basically caused by one primary cause, dehydration.       Dehydration caused by the drying out of evergreen needles during the winter months causes the needles to turn brown, die and fall.  Although a minor amount of needle drop is common late fall, too much can cause fatal results to many trees.  The dehydration is caused by lack of available moisture uptake by the shallow roots from the frozen ground, dry air and wind.  This winter will cause more winte...