Common Reed (Phragmites australis): The Cosmopolitan Wetland Giant

Common Reed, Phragmites australis, is a tall, perennial grass found in wetlands on every continent except Antarctica. It forms vast, dense stands that dominate marshes, lake edges, and ditches.

Dominant Growth

This grass spreads aggressively by thick rhizomes and stolons, forming monocultures. Stems can reach 10–15 feet tall, with broad, flat leaves. The large, feathery, purple-tinged panicles appear in late summer, turning silvery-tan. It provides habitat but can be invasive, displacing native wetland plants.

Uses and Management

Historically used for thatching, paper, and biofuel. In constructed wetlands, it aids wastewater treatment. Management of invasive stands includes burning, grazing, herbicides, and water-level manipulation. The native North American subspecies (P. australis subsp. americanus) is less aggressive than the introduced Eurasian haplotype.