Q.New container grape vine
I have just planted a container vine in a polytunnel and would like it to grow up and along a single wire attached the length of the tunnel. Is this possible or do I need more structured frame? Also, should I cut it back now?
I believe you would need a bit more structure for your vines.
I found these links that have more information for you.
http://www.winesandvines.com/template.cfm?section=features&content=113932
http://articles.extension.org/pages/61627/growing-grapes-in-high-tunnels
http://www.winesandvines.com/template.cfm?section=features&content=111842