Certified GKH Gardening Expert
Yes, most definitely cover and protect them. You can use either large buckets or old trash containers depending on the size of the rose bush. Sometimes if they are too big, you can simply wrap a big beach or bath towel around them, then cover that with a big plastic trash bag and weigh the trash bag down with some rocks at the ground. The towel provides some nice insulation and the plastic bag protects the towel from getting wet.