The Genus is a smallish one and usually this species is missing from gardens and I think it is a shame. It is a fairly hardy quick growing deciduous shrub to about 2metres and as the name suggests comes from Japan as well as Korea and China.
In summer it produces clusters of tiny fluffy deep mauve flowers in the axils of the leaves that are followed by tiny purple berries which is more than enough to get you planting it but when you see its dramatic and unusual mauve-purple autumn foliage I know you will want one. I don’t know of any other group of plants that will give these tones in autumn.
It seems happy in average garden conditions, not too dry not too wet, anyhow you know the drill!