Answer: In general, all roses will do better with a good layer of winter mulch. Grafted roses will need to be planted correctly and possibly given additional care so as to protect the graft union for the winter, and just as for all plants roses do better if they are watered if needed in the fall until the ground freezes. Overall health of the plant is also important for winter survival.
The more extreme measured of protection would depend on the specific varieties you are growing since not all roses are equally hardy. For more detailed information about suggested fall, winter and spring rose care for the various types of roses, you might wish to look at a basic guide to rose care. One book I particularly like is Roses for Dummies by Lance Walheim, ISBN 0-7645-5031-4. In addition to basic care this book includes detailed and clear instructions about pruning, complete with diagrams.
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