When/What to put out to stop springtime stickers?

Lawn Burweed. Winter annual weed. You’ll want to apply pre-emergent herbicide in fall, and likely a second application of pre-emergent 8 weeks later as you have a bad infestation.

Recommended pre-emergents for lawn burweed are herbicides with the active ingredients isoxaben (“Gallery”) or Simazine. In south LA apply in late Sept-early Oct and water in within a week or 2 in the absence of rain.

You won’t kill it all the first year, but you can kill the young immature seedling plants missed with the pre-emergent herbicides applications (look like little parsley plants) when they appear by spraying them with post -emergent herbicide in Jan, Feb. Once burweed matures and form stickers (seeds) forget it. Recommended post-emergent herbicides are provided in the fact sheets below.

Here are 2 fact sheets, Clemson & LSU.

Lawn Burweed - Clemson University

Lawn Burweed - LSU AgCenter