Myriophyllum verticillatum, commonly known as Whorled Watermilfoil, is an aquatic perennial herb native to freshwater habitats such as ponds, lakes, marshes, and slow-moving streams across much of North America, as well as parts of North Africa and Eurasia. It typically grows in water depths of up to 3 meters and prefers substrates ranging from light sandy to medium loamy soils. Whorled Watermilfoil reaches up to 3 feet in length with distinctive submerged feathery leaves that have 5-14 pairs of leaflets per leaf, and emergent leaves that are pinnately lobed. It blooms from June to September, producing small, inconspicuous greenish flowers on erect spikes above the water surface.

This species is valued for its use in water gardens and aquariums due to its ability to oxygenate water and provide habitat for aquatic life. It requires full sun to part shade and can grow in a variety of water conditions, from still to slow-flowing, with a preference for neutral to slightly acidic pH. While it can be beneficial in its native habitat, Whorled Watermilfoil is potentially invasive outside its native range, where it can form dense mats that disrupt water flow and outcompete native vegetation. Gardeners should ensure it is not invasive in their area before cultivation.CC BY-SA 4.0