It is my understanding that when pruning blueberry bushes, the oldest or heavy woody stocks should be cut down to ground level so that the energy goes to the younger, less woody parts of the bush.
I have, in the past always cut back the growth along the shore. It always seems to come back better than ever, so I don't think trimming or thinning out the shoreline growth has any negative impact on the health of the shoreline root system.
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