Physically cutting Bulrushes and digging up the roots can be a somewhat successful way to manage this plant, but Bulrushes can regrow from any remaining roots or seeds.
Imox herbicide and a Surfactant will effectively control Bulrush. 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 Bulrush plants 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.