Pruning currants is best done during the dormant season in later….

Winter. Red/yellow currants bear fruit best on stems 1-4 years old. Black currants bear on 1-2 year old wood. When pruning, cut away wood more than 2 years old. The object is to keep plant open to help fight mildew and keep replacing branches that are 3+ years. Begin pruning after the third year from planting.