We've recently moved home, and in the garden there was a very old grape vine, it's beautiful and intend on keeping it. This year we had hundreds of bunches of grapes however the grapes only grow to the size of small peas (red grapes). I was wondering if there was anything that i could do to improve the size of the crop. Not sure what type of grape vine it is as like i mentioned it is quite a mature grape vine, and i don't think the previous owners have really looked after it or really prunned it. I was thinking of pruning it this year maybe that would help, but have no idea how far back i should prune this vine back to.
Hope someone can help!