I went and looked at a field and realized that our vines weren't pruned enough. We are going to have our hands full come spring. If we don't prune them more, the leaves will be too shady and our grapes won't ripen enough!
Oh that stinks! What happened that made you not do this at the end of your season? Will it hurt the vines to prune in early spring? I would think you might stunt the regrowth?
Oh crud! I've got a friend who owns a vineyard. He had this problem once, he fell ill. It was okay in the end. He just made sure to prune them late winter/early spring.
I just audibly gasped, because most shrubs, trees, and other plant life need pruned on a specific timetable. In other words, you've probably been really lucky at guessing correctly about when to prune them.