We've all heard about Box Blight, which is ravaging across the land, ruining decorative clipped Box hedges left, right and centre, but it's worth mentioning…
They are fully to frost hardy and will require sun or semi-shade in any soil but waterlogged soil. You will need to trim back the hedges during the summer. Promote new growth by cutting back stems to 30cms or less in late spring.
You can propagate by semi-ripe cuttings in the summer.