Grapevine, inside or outside?

[mint]

what is the best time to prune a vine mine has loads of leaves but no friut where am i going wrong

[pigletwillie]

We have 2 cardinal grape vines planted in the tunnels and two planted ourtside over arches.

They are allowed to grow as a single rod and about 1/3 of the new growth is cut back every year. Once the flowers appear on the sideshoots, the sideshoots are cut back to 2leaves after the fruit truss. Any non fruiting sideshoots are cut back to about 6" during the summer.

They fruit really well Evington Hilltop Adventures: Its been a long time but! as you can see.

As for the roots, well as long as they can spread outside the tunnel or greenhouse all will be ok.