How to manage Tansy Ragwort?

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The Clackamas Soil and Water Conservation District had an article on tansy ragwort as their featured invasive weed of the month for July.

The article states:

  • Mowing is not a good control for tansy ragwort. While it may prevent the plant from immediately producing seeds, it also stimulates additional vegetative growth. This leads to more plants and more stems per plant in the same season. Mowing is especially problematic in pastures, where it can spread the toxic leaves, making it harder for grazing animals to avoid.

This article by Melissa Fery of OSU Extension has more information on managing tansy ragwort.

To help control tansy ragwort:

  • Don’t overgraze pastures. The best defense against tansy ragwort is a strong stand of grass.
  • Now (August) is not the time to spray. It should be done in spring before the plant bolts, or in fall when new seedlings are still rosettes.
  • Mowing pastures after seeds have matured on the plant is not recommended because the seeds can spread – and they can live in the soil for as long as 10 years and then germinate. Mowing can cause the plants to become short-lived perennials and grow back the following year. It also limits the food source for the biocontrol insects.
  • If the acreage is small, the weed can be dug out and burned, buried, or sealed and taken to a landfill. Composting generally doesn’t work because the average compost pile doesn’t get hot enough to kill the weed seeds.

Learn more about Tansy Ragwort here.

Good luck!

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