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Knock Out® Roses and Drift® Roses are tough and can make it through anything. But, if you live in an area with harsh winters (zones 4 and below) there are a few things you might want to try.
To protect your roses, you should do the following:
Add 2-3" of mulch, leaves, or pine/fir boughs around the base of the plant. A heavy snow cover will also help insulate and protect the plant through the winter. Also, the winter winds can really dry out the plant so you may want to wrap the plant with burlap. In spring, remove any extra mulch that may be covering the plant too deeply and trim out any dead or broken canes, also remove any burlap that you may have used to wrap the plant.
Tree roses will need even more protection. In areas where the temperatures fall below 10' F in winter, tree roses should be wrapped with insulating material to protect them from the cold and wind. In the colder areas where the temperatures fall below zero, the only adequate protection for tree roses is to lift them in late fall before very severe freezing weather and bury them in a trench covering them completely with a foot or more of earth.