A few years ago, I transplanted six blueberry plants of a couple of different varieties on our land up north. Each were within the growing zones, and our land has wild blueberries growing wherever they aren't crowded out by other vegetation. There are wild blueberries within a few feet of them, and the wild plants have berries every year. However, while these plants still look healthy, they have never flowered or bore fruit. I am not sure what the problem might be, but I have had similar results with raspberries in another part of the land; and yes, our wild raspberries do well too.