Floating primrose - willow

Ludwigia peploides

Overview

Photo credit: ©Père Igor
Ludwigia peploides - Floating primrose willow
Habitat:
  • Inland surface waters

Description:
  • The floating primrose-willow is a perennial aquatic plant native to the American continent.

Origin and Distribution:
  • Native to North and South America.
  • It was imported into France in the 19th century as an ornamental curiosity and has since become established in Belgium, France, Greece, Italy, the Netherlands and Spain.

Potential/known impacts:
  • The plant is very fast-growing, being capable of doubling in extent in just three to four weeks
  • It not only shades out any other submerged plants but alters the chemistry of the aquatic environment, thereby reducing dissolved oxygen levels and disrupting entire freshwater ecosystems
  • Additionally, it blocks up economically important waterways that are used for instance for recreation, fishing or navigation, causing major economic damage
  • Given its prolific nature, there is a high risk that it will spread rapidly into further Member States

How could it get here:
  • Being sold as an ornamental pond plant
  • From there, it has the potential to spread to waterways during flood events or through human-derived dumping

Is it found in Northern Ireland?
  • Not present in Northern Ireland

Methods for prevention:
  • Once established, the species is difficult to manage
  • EU-level action therefore includes a ban on sales and any planting or keeping, including in isolated ponds
  • Furthermore, the rapid eradication of any new populations is required to avoid the excessively high costs associated with its management later on
  • Where the species has become widely spread, appropriate management measures have to be taken
  • Report all sightings

You can help by reporting any sightings: @ the Centre for Environmental Data & Recording (CEDaR) - Or via the iRecord App.
Current Legislative Position (Listed on 03 August 2016)
  • This species must not intentionally be brought into the Union; kept; bred; transported to, from or within the United Kingdom, unless for the transportation to facilities in the context of eradication; placed on the market; used or exchanged; permitted to reproduce, grown or cultivated; or released into the environment.
For further queries, you can contact the Invasive Non Native Species (INNS) Team in the Northern Ireland Environment Agency on 028 9056 9558 or Email: invasivespecies@daera-ni.gov.uk
Invasive Species Ireland

Invasive Species Ireland