Answer: You present a rather complicated scenario. You can either transplant, or you can expect fruit, but not both. If you transplant your blackberries in February or March, the plants will have a chance to become established and grow several new canes that will bloom and fruit the following year. Go ahead and prune the plants hard so they're easy to handle during the transplant process. Then expect a year's wait before they will be able produce fruit. As a compromise, transplant a few this year, and a few the next.
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