Answer: In addition to the usual protective mulch, it is important that the plants go into cold weather well watered. Do this by a deep soaking rather than frequent light sprinklings. Often winter damage is as much a result of drying out (think of freeze drying) and wind as it is the cold alone. You might also think about erecting wind breaks if you are in a windy location. Finally, snow is a good insulator, so if the temperatures drop into the teens and colder and there is no snow cover due to the drought you may want to increase the depth of your usual mulch cover to try to add a bit more insulation that way. Evergreen boughs or other fluffy airy mulch atop perennials can also help if there is no snow.
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