I would start with a soil test. The correct pH and nutrients are vital for fruit development. You will also have more fruit if your plants are different varieties. Cross-fertilization produces a bigger crop unless you have a self-fertile cultivar. Do your plants flower but not set fruit? If so, they are not getting pollinated. Try planting bee-friendly flowers near-by that flower about the same time as the blueberries. Here is a comprehensive review of blueberry care in PNW. https://catalog.extension.oregonstate.edu/ec1304/html
Answered on March 24, 2018
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