Viburnum davidii¹ are one of my favourite exotic shrubs, I’ve always loved their deeply grooved, hard leaves and their blue winter fruits. They make a great low windbreak to about 1.5 metres and are simply an all-round pleasing and reliable shrub in most conditions down to about -10°C – zone 7\8.
You need to ensure you obtain female plants, else you won’t get berries – the most reliable way to do this is visit the nursery when they are fruiting, or only buy from very trustworthy nurseries. They are best left unpruned unless you really know what you are doing.
Davidii may be of use in organic horticulture as they provide a refuge for several predatory mites. A good place to start with this is Overwintering and Comparative Sampling of Neoseiulus fallacis on Ornamental Nursery Plants researchgate link 190Kb
This paper A chloroplast tree for viburnum (2.8Mb) covers current understanding of relationships within the genus Viburnum. There’s some wonderful images here from leaf level downward as well as seeing plant relationships presented graphically – this sort of info is vital when one wants to use a new plant, or an old plant in a new situation and need a guide as to how it could fit.
1 – Viburnum has recently been placed in the Adoxaceae family and sits alongside Sambucus \ the elders.