Belongs to: invasive aliens

Floating pennywort Hydrocotyle ranunculoides

Also known as: water pennywort

Non-native invasive

Best time to see: Apr to end Oct

Key facts

Creeping water plant, forming dense floating mats on ponds and watercourses, excluding all light and reducing oxygen levels

Extremely damaging to native wildlife and banned from UK sale since 2014


Bright green round but scalloped leaves at or just above the water surface, with a slit where the stem joins on below

Flowers are rarely seen

  • photo

© Noel Zia Lee