My roses are spending their first winter here, where it's much colder than they're used to. I bundled them up with mulch, but am worried it might not be enough. It's already snowed so much the roses have disappeared. We are expecting single-digit and below zero weather here soon. Is there anything I can do to protect them even further? Will I have to wait until spring or the threat of frost is gone before knowing if they made it through the winter?