Control Giant Reed

This non-native plant can be an aggressive invader of native plants across the southern half of the United States. Giant reed stems are so thick and tall that it is hard to control. The following options can be considered for how to control giant reed.

Click here to read more about identifying this plant.

Manual/Mechanical Control:

If you are considering how to remove giant reed, physically cutting this plant and digging up the roots can be a somewhat effective method of control. Removing all parts of the root system is important because giant reed can re-grow from any roots or seeds left in the area.

Frequent mowing has sometimes been successful.

Herbicide Control:

There is an option for how to kill giant reed that offers good control.

1. Cattail and Water Lily Control (Imox + surfactant) (for ponds or lakes) – liquids that are mixed and diluted with water and sprayed directly on the entirety of exposed plants.

Treatment Tips:

When treating giant reed,

• With Imox or other systemic herbicides, treatment is most effective when the plants are mature or close to full grown. This allows for more plant surface to spray enough mixture on.
  • Treat in late summer to early fall to get better kill of the root systems. At this time, plants are pulling energy into their roots to store for the winter.
  • Two treatments will likely be needed.