Mid-November is the right time to get your roses ready for winter. Most of the winter damage to roses and perennials comes from temperature fluctuations, dry winds and lack of moisture. It's not uncommon for the winter daytime temperatures to be surprisingly warm, followed by very cold nights. Freezing night time temperatures followed by thawing out during the day can affect the soil around your roses and cause root and graft damage. There are three things to do now. First, make sure your roses are well hydrated, so give them a good drink of water. Plants with dry roots suffer more in cold temperatures than plants with wet roots. While you're at it, water your trees and shrubs as well. ". " to 10" of mulch your roses to keep the ground cold and stable. Adding mulch at this time helps stabilize the soil temperature and prevent damage due to the freeze/thaw cycle. Mulching also helps prevent moisture loss. Roses that have been watered well and then mulched stand a better chance of surviving the winter than roses with dry roots. Choose mulch that will stay in place through the winter. Cedar mulch and Gorilla Hair mulch are two good choices. They will stay put without matting down. ° and water your roses, trees and perennials.