The 2007 Easter weekend freeze destroyed the blooms on all of my 12 vines except one. The lucky one apparently is a late bloomer and made it through ok. Also, some of the vines suffered kill-back on the fruiting canes and one year old wood. Some canes were even killed back to about seven inches above the ground. I use the double cordon system on all my vines.
My question is should I prune the canes, which have a new leaf appearing, back to where the cordon splits or just leave it alone. I'm wondering if the cane may have suffered enough damaged to not be in good health. It may be capable of passing some water/nutrients, but perhaps not as much as it would if the freeze hadn't occurred. Thanks.