In article ,
stellacress wrote:

We have four watercress beds in use, with organic status, and an
additional four beds adjacent which we do not want to run water
through. They have a shale base and high water table and we are wanting
to find a vegetable / plant / herb that would be suitable for those
conditions and would be saleable . They are in a sunny, sheltered Devon
valley and apart from the odd duck or moorhen,
are undisturbed !

I'm not sure what the criteria for "salable" are but if it
were me I'd plant Nile Papyrus.

--
Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
633CSi 250SE/C 300SD | http://aquaria.net http://killi.net