Floating Pennywort(Hydrocotyle ranunculoides)
Known commonly as water pennywort, floating pennywort, or floating marshpennywort. This very popular and widely available aquatic plant forms dense mats of rounded leaves that float across the water surface.
It is most common in the wild in south-east England but is appearing more often in the west, the midlands, Wales and also Ireland.
It can be commonly found on lakes, ponds and other water-based habitats.
Floating pennywort causes a range of problems including changing the availability of oxygen in the water, threatening fish and invertebrates, choking drainage systems and crowding our native water plants.