When is the best time to prune grapevines?

FAQ
Question: 

When is the best time to prune grapevines?

Answer: 

The most desirable time to prune grapevines is late winter or early spring.  In Iowa, pruning can begin in late February and should be completed by early April.  Grapevines pruned at this time of year may “bleed” heavily.  However, the loss of sap does not harm the vines.  

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