Rachel Lambert: forager, author, guide
Growing wakame in Plymouth marina

Wakame (Undaria pinnatifida) is also known as apron-ribbon vegetable, Asian kelp or Japanese kelp. It is a delicious seaweed native to Japan, China and Korea. It has been harvested in Japan for around 1,500 years and cultivated there since the 1950s.

In the mid 1990s, wakame turned up in British waters. It can be found in small amounts along the south coast in marinas, off pontoons and in estuaries.

In this blog I discuss how to identify wakame and where to find it. I share a video of it in and out of water, the benefits (and problems) with it and recipe ideas!

Where does wakame like to grow?

I found these samples of wakame with fellow MBA students in and around Plymouth. We were all fascinated by seawaeeds and were attending a 3-day course with the Marine Biological Association. Wakame arrived in the UK via the marine culture and shipping. This method also brought it to France, Belgium, Spain, USA, Argentina, Australia and New Zealand.

Wakame thrives in cold water, preferring and reproducing at temperatures of 5-15°C and at up to 20°C. British sea waters are a perfect environment for it to grow, as it ranges from an average of 6-10°C in the winter and 15-20°C in the summer. It is a seaweed we could expect to see more of.

Wakame can also tolerate changes in salinity and therefore grows well in estuaries where seawater meets fresh water.

It grows in a variety of conditions and can form dense kelp forests. Here is an image of a single piece of it.

What does wakame look like?

Wakame is a member of the kelp family and has a similar look and thickness to Dabberlocks (Alaria esculenta) and Sugar kelp (Saccharina latissima).

Wakame has a ragged edge making it look like fingers or ribbons (see above). It grows up to 3 metres long and has a mid-rib or stem running through the middle of the seaweed, along its whole length.

Wakame is a yellowy-brown seaweed. It is a lot lighter in texture than many other kelps such a oarweed (Laminaria digitata) or forest kelp (Laminaria hyerborea).

The benefits of wakame seaweed

Wakame contains good amounts of; folate, vitamin C, calcium, iron, magnesium, manganese, B2, B3 and B5. It is a light seaweed that an be eaten raw. It is slightly sweet and can be used in similar ways to Alaria escunlenta.

Traditionally pieces of wakame are added to miso soup. In my Seaweed book I share recipes for a crab or carrot and ginger salad with alaria and a sauerkraut and kimchee recipe using it too. Wakame could easily replace alaria in these recipes.

For food lovers, this possibility of finding wakame locally is exciting, yet there is a bigger picture too. Wakame is listed as one of the top 100 worst invasive species. However sightings in the UK are still minimal.

If and when wakame increases and becomes an abundant or problematic seaweed here in British waters, there is an easy, ethical and healthy way to reduce it's presence. Forage it by hand and eat it!

Want to find out more about edible seaweeds?

I lead monthly seaweed foraging courses, offer private seaweed tuition, have lots more seaweed blogs and cover 5 seaweeds with recipes in my wild food foraging book and 16 seaweeds in my seaweed book. Happy foraging.

  1. www.fishsite.com
  2. www.wikipedia
  3. Seaweeds of Britain and Ireland by Francis Baker, Juliet Brodie, Christine Maggs and Anne Bunker
  4. Seaweed Foraging in Cornwall and the Isles of Scilly by Rachel Lambert

I've been reading in this Saturday's Guardian how Thomasina Miers has been supping lots of soup so far this year, and I feel like saying 'me too', though not for the same reasons many women have validly and valiantly been saying this across continents.

Tommi Mier's restaurant chain Wahaca specialise in Mexican food, and while this isn't a Mexican dish, it is definitely inspired by the spicy punch that Mexican food often has. My me too is about supping soups. Soups that are warming, healthy and bring people together, especially on a cold March morning. It's been cold, too cold and soup is the perfect remedy, this one's got a chilli kick to get your inner fire going, if it isn't already by the outrageous scale of the #metoo movement and the injustices it highlights.

Back to the soup.

Fresh Kelp, Oarweed, Laminaria digitata

This soup using 3 locally foraged seaweeds;

  • Kelp (Laminaria digitata)
  • Sugar kelp (Saccharina latissima)
  • Sea spaghetti or Thongweed (Himanthalia elongata)

These could also be substituted for a mixture of;

  • any kelp seaweed (Dabberlocks, Oarweed, Furbelows, Wakame),
  • any wrack seaweed (Bladder wrack, Serrated or Toothed, Spiralled)
  • pepper dulse could also be used instead of black pepper for one layer of the 'kick'.

Oh, by the way, kelp is called kombu in Japan, and the basis of this soup is similar to a vegan version of dashi stock which combines kombu and shitake mushrooms (and omits bonito flakes which are fish).

There is lots, lots more I could say about seaweed, and soups, though here I'll keep it simple and just offer you this recipe.

Thongweed, Kelp and Sugar Kelp soakingThongweed, Kelp, Sugar Kelp

(Soaking the seaweed and straining off the ingredients for making the broth)

Three Seaweed Soup

A warming broth which is so simple to make and is great on its own or can be used as a base for a noodle soup or more of a substantial soup, broth or stew.


  • 12cm length of dried kelp (or 1/3 more if fresh)
  • 12 cm length of dried sugar kelp (or 1/3 more if fresh)
  • 10cm single length of sea spaghetti (or 1/3 more if fresh)
  • 2 litres boiling water
  • 1 medium onion, finely chopped
  • 3cm chunk of ginger root, chopped
  • Lots of freshly ground black pepper
  • small handful of dried chanterelle mushrooms
  • 1-1/2 tsp dried chilli flakes
  • soy sauce to taste

Cut all of the seaweeds into small pieces and place in a large pan. Add the boiling water, then all the rest of the ingredients, except the soy sauce. Place a lid on the pan and leave to simmer for 40 minutes. Place the mixture in a food processor and blend till the pieces are broken down, or strain if you prefer a clear broth. Add the soy sauce to taste. Serves 6 as a small bowl of soup, or 12 as a small starter/taster.

Seaweed broth with thongweed, kelp and sugar kelp

The finished Broth, before I ladle it into a hot food flask and take it to the beach to share with participants on a seaweed foraging course.

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