Common Water-starwort (Callitriche stagnalis) is an aquatic plant species belonging to the Callitrichaceae family. As its name suggests, it is a common sight in freshwater habitats across the UK, including ponds, lakes, slow-flowing rivers, and ditches.

Common Water-starwort typically thrives in shallow, nutrient-rich waters with a muddy or sandy substrate. It can tolerate a wide range of water conditions, from still to slow-flowing, and is often found in both sunny and shaded areas of aquatic habitats.

As an aquatic plant, Common Water-starwort plays a vital role in freshwater ecosystems, providing habitat and food for various aquatic organisms, including insects, fish, and waterfowl. Its dense mats of foliage offer shelter for small aquatic animals and help stabilise sediments.

Behaviourally, Common Water-starwort is a perennial plant that grows either submerged or partially submerged in water. It reproduces through both sexual and vegetative means, producing seeds and spreading through rhizomes to form new plants.

With its delicate foliage and ability to thrive in diverse aquatic habitats, Common Water-starwort is appreciated for its ecological importance and aesthetic appeal. However, it is also considered a nuisance weed in some water bodies, where it can form dense mats that impede water flow and reduce biodiversity.

Culturally, Common Water-starwort may not have significant cultural references in the UK, but it is valued for its role in supporting freshwater biodiversity and maintaining healthy aquatic ecosystems.

An interesting fact about Common Water-starwort is its ability to tolerate low light levels, allowing it to grow in shaded areas of water bodies where other plants may struggle to survive. Additionally, some species of waterfowl, such as ducks and geese, feed on Common Water-starwort as part of their diet.