Sometimes its hard to see the forest because of the flakes.
When the snow starts melting off of the plants (or just blowing off in the wind), they are again exposed to the winter cold.
Most rhododendrons will curl their leaves and droop when the temperature gets in the low 20's.
Then there comes the occasional ice storm. Trees tend to break off branches, and some even topple from the weight of the ice. The lowest branches won't break - they are supported by the ground.
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