Seaweed species guide

Horizon Seaweed is licensed to pick seventeen different varieties of seaweed native to the Caithness coastline. This includes the key species that we schedule into our harvesting plans, although there are many smaller species on our sites than can only be picked in limited volumes. Nevertheless, we can access a range of species from approved external suppliers (e.g. Irish moss, pepper dulse, laver / nori and sea lettuce). Please contact us for more information about seaweeds marked as harvested upon request, including advice on sourcing.

Months of wild harvest seaweed production

A decade of surveying shores around Scotland has given us a detailed knowledge of harvest seasons. Some species are only available for windows of a couple of months, whereas others can be picked almost year-round. There is always variation year-to-year: a mild winter can be an opportunity to harvest early, but autumn storms can bring a season to an early end. This is all part of working with nature, but we aim to begin harvesting a species when the rates reach commercial scale. Indicative seasons for our key species are given below. Please contact us if you would like to learn more about production months.

Species January February March April May June July August September October November December
Bladder wrack
Fucus vesiculosus
Bladder wrack thumbnail
Is available during January Is available during February Is available during March Is available during April Is available during May Is currently not available during June Is currently not available during July Is currently not available during August Is currently not available during September Is available during October Is available during November Is available during December
Toothed wrack
Fucus serratus
Toothed wrack thumbnail
Is available during January Is available during February Is available during March Is available during April Is available during May Is available during June Is currently not available during July Is currently not available during August Is currently not available during September Is currently not available during October Is currently not available during November Is available during December
Spiral wrack
Fucus spiralis
Spiral wrack thumbnail
Is available during January Is available during February Is currently not available during March Is currently not available during April Is currently not available during May Is currently not available during June Is currently not available during July Is currently not available during August Is currently not available during September Is currently not available during October Is currently not available during November Is available during December
Knotted wrack
Ascophyllum nodosum
Knotted wrack thumbnail
Is available during January Is available during February Is available during March Is available during April Is currently not available during May Is currently not available during June Is currently not available during July Is currently not available during August Is currently not available during September Is available during October Is available during November Is available during December
Channelled wrack
Pelvetia canaliculata
Channelled wrack thumbnail
Is available during January Is available during February Is currently not available during March Is currently not available during April Is currently not available during May Is currently not available during June Is currently not available during July Is currently not available during August Is currently not available during September Is available during October Is available during November Is available during December
Atlantic wakame
Alaria esculenta
Atlantic wakame thumbnail
Is currently not available during January Is currently not available during February Is available during March Is available during April Is available during May Is currently not available during June Is currently not available during July Is currently not available during August Is currently not available during September Is currently not available during October Is currently not available during November Is currently not available during December
Kelp
Laminaria digitata
Kelp thumbnail
Is currently not available during January Is currently not available during February Is available during March Is available during April Is available during May Is available during June Is available during July Is available during August Is available during September Is available during October Is available during November Is currently not available during December
Sugar kelp
Saccharina latissima
Saccahrina latissima, sugar kelp seaweed in a rock pool. thumbnail
Is currently not available during January Is currently not available during February Is currently not available during March Is currently not available during April Is available during May Is available during June Is available during July Is currently not available during August Is currently not available during September Is currently not available during October Is currently not available during November Is currently not available during December
Tangle
Laminaria hyperborea
Laminaria hyperborea tangle kelp washed by a current through a gully on the low shore thumbnail
Is currently not available during January Is currently not available during February Is available during March Is available during April Is available during May Is available during June Is available during July Is available during August Is available during September Is available during October Is currently not available during November Is currently not available during December
Sea Spaghetti
Himanthalia elongata
Sea Spaghetti thumbnail
Is currently not available during January Is currently not available during February Is currently not available during March Is available during April Is available during May Is available during June Is available during July Is currently not available during August Is currently not available during September Is currently not available during October Is currently not available during November Is currently not available during December
Dulse
Palmaria palmata
Dulse thumbnail
Is currently not available during January Is currently not available during February Is currently not available during March Is currently not available during April Is currently not available during May Is currently not available during June Is currently not available during July Is available during August Is available during September Is available during October Is available during November Is currently not available during December
Irish moss
Chrondrus crispus
Freshly harvested Chondrus crispus Irish moss thumbnail
Is currently not available during January Is currently not available during February Is currently not available during March Is currently not available during April Is available during May Is available during June Is available during July Is available during August Is currently not available during September Is currently not available during October Is currently not available during November Is currently not available during December
Pepper dulse
Osmundea pinnatifida
Tufts of Pepper dulse Osmundea pinnatifida growing near wrack on a rocky shore thumbnail
Is available during January Is available during February Is available during March Is currently not available during April Is currently not available during May Is currently not available during June Is currently not available during July Is currently not available during August Is currently not available during September Is currently not available during October Is currently not available during November Is currently not available during December
Laver
Porphyra species
Laver or nori seaweed hanging from a boulder above pebbles thumbnail
Is currently not available during January Is available during February Is available during March Is available during April Is available during May Is currently not available during June Is currently not available during July Is currently not available during August Is currently not available during September Is currently not available during October Is currently not available during November Is currently not available during December
Sea lettuce
Ulva lactuca
Green Ulva sea lettuce on a rock by breaking waves thumbnail
Is currently not available during January Is currently not available during February Is currently not available during March Is currently not available during April Is available during May Is available during June Is available during July Is available during August Is available during September Is currently not available during October Is currently not available during November Is currently not available during December