Oarweed ©Becky Hitchin


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Scientific name: Laminaria digitata
The tops of Oarweed fronds can be spotted floating on low tides. Kelp beds are an important habitat, providing shelter for many other marine creatures.

Top facts


Length: up to 2m

Conservation status


When to see

January to December


Oarweed is a common kelp seaweed found in shallow seas around our coasts. They grow in dense kelp beds, attached to rocky seabeds using tough, root-like holdfasts. They grow at depths of up to 20m and the floating fronds may be exposed at low tide. Their holdfasts create a microhabitat for many small species - including worms, brittle stars and even sea spiders! So if you spot kelp washed up on the shore, look closely at the holdfast (looks like roots) and see if anything is inside! Oarweed's fronds are flat and split into finger-like sections, often remembling a hand. The stipe is very flexible, allowing it to bend right over on very low tides and stop the fronds from drying out. It also allows it to survive rough and stormy conditions.

What to look for

Oarweed is a typical 'kelp' seaweed, dark browny-green, with long fronds split into long 'fingers' or 'ribbons'.

Where to find

Common on rocky shores all around our coasts.

Did you know?

Oarweed, also known as Tangleweed, has been used by humans for centuries for fertiliser, food and as a source of chemicals.