People often ask what will kill Phragmites or how to kill Phragmites. There are a couple options for how to remove Phragmites.
Physically cutting Phragmites and digging up the roots can be a somewhat successful way to manage this plant, but Phragmites can regrow from any remaining roots.
Imox herbicide and a Surfactant will effectively control phragmites. These products together are called our Cattail and Water Lily Control. Thoroughly wetting the plants in late summer or early fall is the most practical time to treat. This is when Phragmites are directing their energies to the root system, which helps pull the herbicide down to the roots to kill both those and the vegetative portions. A second treatment is likely needed.