Lonicera caerulea - NEW. Duet is a recently-introduced cultivar of a fruiting shrub from Siberia and Kamschatka. The long, blue-black berries, produced in mid to late season, have a pleasant sweet but tangy flavour. Although self-fertile, this variety will produce a bigger crop if grown with another variety or cultivar. Height to 1.5 metres. Best in full sun. Tolerates slightly acidic soil. Very hardy. Priced for a 3 litre pot