When to prune a grapevine Dornfelder
I have a dornfelder grapevine and it it growing rather rampantly. It is about 4 years old and getting a bit out of control. I have (ehum) not pruned it just let it get on with it. As it is getting everywhere and blocking light out to the border I need to rein it in a bit. When would be a good time to try to get some kind of framework done? The various branches probably reaches at least 20 odd meters.
The grapes also tends to be rather small but that might be because I either pick them too early or let too many ripen. When do people pick theirs? I start in September.