A delivery of bare root plants from Shipton Bulbs included five muddy rhizomes of Soloman's Seal (Polygonatum multiflorum). They can be propagated by dividing the rhizome where it forms a knuckle. I watched a video on the subject recently presented by one of the gardeners at Beth Chatto's garden. He made the point (which hadn't occurred to me) that the stem arches backwards from the bud over the rhizome. So if you want the stems to fall in a particular direction they should be planted accordingly.

 Having said that all plants have a tendency to lean towards the light so I imagine the shoot has a tendency to adjust itself? But it seems sensible to begin by positioning the rhizome in the right orientation. Soloman's Seal is a catch all name for a number of species and cultivars in the Polygonatum genus most of which are characterised by the graceful arching stems that flower in late spring/early summer.