It will produce plant biostimulant using sustainable seaweed from its farms off the Pembrokeshire coastline. : It will produce plant biostimulant using sustainable seaweed from its farms off the Pembrokeshire coastline. Regenerative seaweed and shellfish farm, Câr-y-Môr, is investing a new seaweed processing facility – which will be the first of its kind in Wales. Construction on the facility at a site in St Davids for the Community Benefit Society (CBS) structured business owned by its 260 members, will begin later this year. It will produce a plant biostimulant using sustainable seaweed from its farms off the Pembrokeshire coastline.