Concord grape vine ,2 years lots of grapes ..this year none?

Anytime you grow something else near your grape vines you want to make sure it won't interfere with your grapes roots.(which can grow up to several feet away from the base of the plant) The other vine may have taken away some nutrients. Also, did you make sure to prune your vines? It is necessary to do this after each growing season.

Except after the first year it is not necessary.

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