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Beside this, can you prune barberry to the ground?
Any barberry species can be cut back right to the ground. If you cut them back to stubs before they push out any of their preplanned growth, they will form new growth from dormant buds
One may also ask, what is hard pruning?
Hard pruning is a pruning technique that removes quite a lot of wood. You should prune in winter when the tree is dormant and cut back to three buds on each spur bearer, a lateral branch that grows on a framework or primary branch.
Berberis thunbergii and all other deciduous Berberis need pruning right after they have finished flowering - late spring or early summer. Together with this, if you prune these Berberis too early (before flowering in spring) you will prune out all of the flower buds for the current year.