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

Cooper's barberry · Berberis cooperi
Grows in any soil except waterlogged. A sunny position will encourage fruiting. For more information please see shrub cultivation.
Usually little pruning is needed. Lightly shape if necessary, removing dead, damaged or diseased shoots. Prune after flowering.