These cool climate loving berries do best in full sun but will also tolerate partial shade.
If grown in full sun the berries will be sweeter. Berries can be harvested in mid summer. Feed the Red Currants regularly and keep them well watered - don't drown the roots; just keep them damp. Red Currants have a high need for potassium, so be sure to use fertilizer well endowed with potassium, such as seaweed fertilizers. Once your plants have developed large, firm red berries you can harvest. This usually occurs mid-summer.
Harvesting is easy: just cut the whole bunch. Red Currants bear their fruit on old wood so prune new growth back to two buds in early summer to keep plants compact.