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.
Put on gloves and eye protection to protect yourself from coming in contact with the herbicide.
Dilute the selective postemergence herbicide according to the product directions.
Pour the herbicide into a sprayer. Spray the herbicide directly on the leaves of the stinkweed.
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.