Miniature roses are actually pretty tough plants. They’re almost always propagated and grown on their own roots, which gives them greater hardiness in cold weather than many other types of roses. Like most plants, however, they’re not real thrilled with harsh winter winds and the nasty freeze-and-thaw cycles that some winters bring. Even though your miniature roses will most likely live and do fine the next season no matter what you do or don’t do, if you live where temperatures regularly fall below 10°F (–12°C), they’ll suffer less damage and thrive more readily if you mulch the base of the plant with leaves for winter protection.