Purple loosestrife flowers close up in group

Control Purple Loosestrife

Many people ask how to get rid of purple loosestrife. The following options can be considered for how to control purple loosestrife.


Manual/Mechanical Control:

If you are considering how to remove purple loosestrife, physically cutting this plant and digging up the roots can be a somewhat effective method of control. However, physical control can be difficult. Purple loosestrife can re-grow from any seeds or roots remaining in the area.


Herbicide Control:

There is an option for how to kill purple loosestrife that offers great control.

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


Treatment Tips:

When treating purple loosestrife,

  • 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.
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