Answer: It is good that you are training your grapevines rather than letting them sprawl. This produces a stronger cane and allows for easier maintenance.
Spring is the best time to prune your grapes. The University of Minnesota has a Web site with excellent information on growing and pruning hardy and tender varieties of grapes.The address:
The site illustrates the four-arm Kniffen system of pruning grapevines (which uses wires and poles). Good luck and enjoy your grapes.
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