Answer: Rose trees such as this require special protection during the winter because they are high grafted. Usually in cold winter climates such as yours they are maintained as container plants so they can be easily moved to a sheltered place for the winter. Since yours is planted in the ground, you will need to try a version of the so-called Minnesota tip in which it is buried in a trench. To do this, cut the roots on one side of the rose tree so you can bend it over flat. Bury it in a deep trench, then mulch over top of that. To make it fit, you can trim it back quite hard. In early spring, trim again as needed to tidy up the shape. Wait to bury it until late fall when it has stopped growing. In the early spring, dig it up and reset it so it can wake up naturally with the season. Good luck!
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