Invasive Common Reed and Pond Health

Phragmites australis, also known as Common Reed, is a tall, perennial grass found along the edges of lakes, ponds, ditches, wetlands, and other drainage areas. While a native subspecies exists, it’s the non-native, invasive strain of Phragmites that poses serious ecological challenges. This aggressive invader spreads rapidly forming dense patches that disrupt pond ecosystems, degrade habitat, and reduce overall pond health.

At first glance, Phragmites may appear harmless—lush, green, and even attractive—but beneath the surface, it’s one of the most ecologically damaging wetland invaders in North America. Once established, it can dominate shorelines and shallow waters, outcompeting native species and altering the function of entire aquatic systems.

Growing up to 15 feet tall, it spreads primarily through an extensive rhizome network, which can expand over 10 feet per year. While each plant also produces thousands of seeds, vegetative spread is its dominant method of colonization. Phragmites quickly outgrows native plants, forming thick canopies that block sunlight. By late summer, it flowers and shifts energy to its roots for overwintering. Dead stems persist through winter, adding litter and altering habitat structure. Like many invasive species, Phragmites thrives in disturbed, nutrient-rich, and even brackish environments. Its aggressive growth and ability to change soil and water conditions make it a major threat to native wetland ecosystems.
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​Phragmites is both a symptom and a driver of declining pond health. Its spread often signals an ecosystem under stress—typically from elevated nutrients or shoreline disturbance. Once dominant, it worsens these issues by trapping sediment, reducing habitat complexity, and displacing critical native species.
Healthy ponds rely on a balance of open water, submerged vegetation, and diverse native plants along the shore. Restoring and maintaining this balance requires not just removing invasive species like Phragmites, but also addressing the ecological conditions that allow them to thrive. 

Invasive Phragmites can grow up to 16 Feet tall

To learn more about how to identify and manage Phragmites australis, please see this fact sheet from the Indiana Department of Natural Resources on Common Reed or email Jacob Luken ([email protected]) for a personalized management plan on your property. 

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Invasive Phragmites root systems create dense networks that choke out beneficial native plants.