How to Prune Darwin's barberry?
Usually little pruning is needed. Lightly shape if necessary, removing dead, damaged or diseased shoots. Prune after flowering.

Darwin's barberry · Berberis darwinii
Grows in any soil except waterlogged. A sunny position will encourage fruiting
Usually little pruning is needed. Lightly shape if necessary, removing dead, damaged or diseased shoots. Prune after flowering.