How to Kill Stinkweed in the Grass


Stinkweed (Thlaspi arvense) is considered an annual or winter annual plant that reproduces by seed. Its name comes from the plant's unpleasant odor. Stinkweed grows to a height of 2 inches to 2 feet and blooms small, white flowers. One stinkweed plant can produce up to 15,000 seeds. To avoid stinkweed taking over your entire lawn you will want to eradicate it before the plant has a chance to go to seed.

Step 1

Put on gloves and eye protection to protect yourself from coming in contact with the herbicide.

Step 2

Dilute the selective postemergence herbicide according to the product directions.

Step 3

Pour the herbicide into a sprayer. Spray the herbicide directly on the leaves of the stinkweed.

Step 4

Repeat the application process 30 days after the initial application if the stinkweed is still present. Multiple applications may be necessary to completely rid your lawn of stinkweed.

Tips and Warnings

  • A selective postemergence herbicide will not kill your grass, but it will harm trees, shrubs and plants. Do not allow the herbicide to come in contact with any of these plants.

Things You'll Need

  • Gloves
  • Eye protection
  • Selective postemergence herbicide
  • Sprayer


  • Manitoba Agriculture, Food and Rural Initiatives: Stinkweed
  • University of Minnesota Extension: Weed Control in Lawns and Other Turf
  • University of Missouri Extension: Home Lawn Weed Control
Keywords: kill stinkweed, stinkweed herbicide, stinkweed treatment

About this Author

Sophia Darby is a former professional hairstylist who has spent the last six years writing hair-related articles for both online and print publications. Her work has appeared in Celebrity Hairstyles Magazine, as well as multiple websites.