We love and care for your canals and rivers, because everyone deserves a place to escape.

Floating pennywort

Introduced to the UK in the 1980s by the aquatic nursery trade, this fleshy-stemmed plant grows into floating mats of lush foliage across waterways.

Floating pennywork covering most of canal with boat moored at side Floating pennywort, copyright GBNNS

This highly invasive plant is a real problem for our waterways. It grows very rapidly in late summer, up to 20cm per day, and is responsible for swamping waterways, blocking water flow, crowding out native plants and taking oxygen from fish and insects. It is becoming more and more of a problem across the country, blocking canals, rivers and other waterways.

Like Japanese knotweed, it also has the ability to grow from miniscule fragments, making its removal incredibly difficult and expensive. We have to physically remove the plant from the water with machinery, which is expensive and time consuming.

Last date edited: 15 March 2018