I use this mainly as a size control prune but will show you how it is suggested to prune for size of fruit. I read a guide that said you want to prune back to 15 buds per whip. I’ve done this forever and don’t have to think about it. If given proper water fertilizer and pruning fruit will increase in size. You are supposed to cut the sets of grape in half. Leaving 5-6 branches forming grapes in a cluster. Removing half the leaves and stems of the plant will decrease the amount of water, nutrients, and energy put into growing leaves and focus on fruit. In life and especially in gardening nothing is guaranteed. These are tips on how I manage my grape vine and how to try and increase the size of fruit harvested. Removing some of the fruit before it’s formed is called thinning, something known mostly to people who grow crops for production.

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