Found lots of info on damage to canes and buds and a little on trunk damage but pretty much nothing that explained how I can tell if my vines are dead and need to be replanted. Most buds bit the dust in winter, and my oldest vines (maybe 6 or 7 years old) have zero buds, and every cane that I have cut into on those plants shows no green at all. I suspect that if I slice into the bark and trunk that I will see no green there either. But if that is the case what does that mean, how can I know if the grapes are completely done? If they are I want to grab a few more merlot plants that I saw at the garden centre before they are gone, but these vines have trunks that are two to three inches thick at their thickest point and i don't want to pull them unnecessarily. Anyone have any resource they can point me to that says "if you are seeing XXXXX then you have no choice but to replant"???