If you are a nursery or garden center most likely your plants are not too mature. However there is still some pruning you can do to your blueberry plants. The best time of year to prune is late winter right before spring hits. If there is ever dead on the blueberry plant it should be pruned, if there are any branches crossing each other they should be pruned, if there are small branches at the bottom they can be pruned off, and if there are branches growing into the middle of the blueberry plant they can be pruned. Pruning the branches near the bottom of the blueberry plant can be especially important for a nursery or garden center, this will allow for maximum top growth of the blueberry plant.
We will have a video on how to prune blueberry plants in containers soon.