Definition
Water milfoil refers to aquatic plants, often submerged, that belong to the genus *Myriophyllum*. These plants have feathery leaves arranged around a central stem, resembling miniature fir trees underwater. They're commonly found in ponds, lakes, and slow-moving streams, sometimes forming dense mats. Water milfoil can be both beneficial and problematic; while it provides habitat for aquatic creatures, it can also become invasive. Think of it as the underwater equivalent of a sprawling groundcover in your garden – pretty but potentially unruly. Some species are native, while others are introduced and can outcompete native vegetation. Understanding the specific species is key to managing it properly.