A good way to help keep your roses healthy is to apply some mulch or compost around the base of the plants to help them overwinter.
Mounding roses is the building up of soil or mulch around the base of a rose bush and up onto the canes to a height of 6 to 8 inches (15 to 20 cm.). These mounds of soil or mulch help to keep the rose bush cold once they have gone through some freezing cold days and nights that have caused them to go dormant.
This is the time when the rose bushes are taking their long winter nap to rest up for a glorious spring. In the spring, spread the mulch or compost around the plants.