[woodburner]

My allotment slopes down to a stream, dry in summer and even in winter it barely flows but is pretty boggy for a few feet either side. So I am wondering whether to plant them in the bit that is boggy in the winter, or a bit further up the slope?

[Trillium]

The best berries come from well watered areas, but you'll also get lots of green growth but I've never found it so much to the detriment of the berries. Mine currently live on a slope and the tops actually began to dry out this past summer. So, this summer after the spring rains, they'll get lots of manure and heaps of shredded leaves (as mulch) bunged over their whole area.  Our summers are much drier than the UK so it's something you'll have to judge for your particular area.