BrazelBerry® blueberries naturally grow in a compact, often spherical form, so you don't necessarily have to prune them. However, if you want to or have to for reasons of space, you can cut them back without any problems. The best time for this is between November and early March, when the BrazelBerry® plants are still dormant.
Tip: pruning thick, dead branches boosts fruit production because the plant then directs its growth energy into producing young shoots with more fruits. 

It's best not to prune Baby Cakes® blackberries in the winter. Completely new shoots as well as new growth on old branches produce blossoms and then blackberries next spring. You can cut any branches that do not produce new growth in spring right back.