[sonnycbr]

I have a hamburg black grape vine growing in one of my tunnels. I haven,t had any grapes off it yet as it is only about 3 years old. I was hoping it would grow along the wire that runs the full length of the tunnel, 20 feet.
The problem is, when the vine came back to life in the spring, the last 3 feet of it was dead.
Do I tie in the last growing lateral or is that as long as the vine will grow?