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!
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.I've never grown grapes or really much of anything that had a specific pruning timetable. I hope it works out for you!