05/27/2026
An update from the Trempealeau County Highway Department and Wild Parsnip.
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Wild Parsnip is a Restricted Invasive Plant in Wisconsin that that has been spreading along roadsides, right-of-ways, prairie and pastures. Contact with the sap to skin in the presence of sunlight can cause blisters and discoloration of the skin (phytophotodermatitis). Care should be taken when in areas of this plant.
This plant flowers in late spring to early summer. Trempealeau County is working on controlling this plant and others along its county roads. We are using a PGR (plant growth regulator) to suppress the grass along with a herbicide to control the invasive plants. This allows us to eliminate a mowing, and controlling our invasives for our county roads. This application does not cause injury to milkweed, supporting monarch butterfly habitat.
