Can someone please explain the theory of how and why of winter protection i.e. does one need to protect to or less than 32 degree temps or protect only from the wind. How do we protect from temps of 5 or 10 deg. -- will stems freeze -- won't the Heart of the Rose freeze at these temps even if covered? If I just protect from the cold wind is that enough? There must be some scientific evidence out there somewhere that can explain all this -- maybe some experments that have been conducted?
Would just straw covering the heart be enough?
I just want to know how best to protect my Roses and maybe try some new methods.