Then loosely tie the canes together with twine to prevent the canes from being whipped by strong winds. Next, build a chicken wire fence around the roses and then mound soil 10 to 12 inches high around the canes. Finally, place additional material, such as straw or leaves, over the mound of soil after the ground freezes. Many home gardeners use styrofoam rose cones to protect their roses. While they are easy and convenient, the styrofoam rose cones often do not provide adequate protection.
Additional material is necessary.
If using styrofoam rose cones, prune the canes back to allow the cone to fit over the plant. Remove any plant debris, then mound 6 to 8 inches of soil around the base of each plant. Set the cone over the plant. Finally, mound a small amount of soil around the outside base of the cone to keep it in place. Secure the cone by placing a brick or other heavy object on its top.