Advice for pruning grapevine
I have a Black Hamburg vine which is about seven or eight years old. It's never realy produced anything except a few pea sized grapes. I've never really had much idea what to do with it and last autumn I followed some advice on how to renevate a vine and this has worked wonders. I have just cut about fifteen or sixteen bunches (of varying size) of good sized grapes. I want to maintain this vine and am wondering what I need to do now that it has finished fruiting.
The main stem is about eight feet long with one main side shoot of about four feet in length at about five feet up the main stem.
It is being grown up against a trelice to a pregola.
I'd be very grateful for suggestions thank you.