My Grape vine again
I posted questions 2 yrs ago regarding my grapevine, it didn't seem to want to grow. I purchased it 3 years ago and planted it correctly with a large hole of rotted manure, during the first year I fed and watered it, it grows in the ground and I led it through a hole in my Polytunnel. So the plot thickens, at the end of last year I took the advice and pruned it back to around 9 inches tall, all that was left was 3 brown stems, this year i noticed that shoots had grown out from each stem just below my cut, the vine went absolutely wild, I had to tie vines to wooden poles that I secured in the tunnel, I ended up with 4 if not 5 healthy vines, and I got around 15 bunches of delicious black seedless grapes, I was over the moon. Now my problem is that I once read something about only allowing 2 good vines to grow, and not 4 or more, one of the vines is the length of my polytunnel, what should I do now ? two of the vines are very woody and 2 are green, where do I begin, should I just leave the woody ones, and cut back the green ? Help please.