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.