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I have an established grapevine growing over a pergola and am wondering how to go about pruning it as it has not been pruned correctly in the early years. The trunk is actually grown vertically up the pergola and horizontally along the front of the pergola. It has many laterals from the horizontal trunk. Should I cut the trunk back to the vertical height then train two laterals? Or should I just continue to prune the 20 laterals growing from the horizontal trunk? I appreciate any help.

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This doesn’t sound too bad as a starting point. It is hard to fully explain here but the object is to create a framework that works up and out each year. The best thing to remember is that grapes are formed on the fresh new growth, not the old wood. So the old wood is the framework taking your vine in a pattern where it needs to go and this shape is accomplished with winter pruning. The new growth forms the grapes and should only be undertaken in summer (once the grapes are forming) to thin the fresh growth and leaves to help shape and sun-ripening.

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