A recent trip to the seaside renewed my acquaintance with Japanese Wireweed a brown seaweed that has become very common around our coasts in recent years.

Several brown seaweeds may be seen on rocky seashores and on sandy beaches where there are hard surfaces such as coastal protection works, breakwaters or harbours. Japanese Wireweed is distinguished from the others by its unusual yellowish-brown colour, its wiry stems and its very numerous and very small gas-filled bladders that give the seaweed buoyancy.

The bladders cause the metre-long seaweed to float just below the surface of the sea. It grows low on the shore so since it has a restricted range it is best searched for near the water’s edge when the tide has fully ebbed.

Wireweed is an invasive alien from the Far East that has managed to colonise our shores…..

Wexford People 06/08/2013 Read the article ‘Wireweed a common sight on our coasts’

Japanese Wireweed growing in a rock pool on the seashore.
Japanese Wireweed growing in a rock pool on the seashore.