Plants Database
Turfgrass Weed Control Database
Corn Speedwell
Three-ways alone do not control corn speedwell. Effective control requires a tank mix of a postemergence herbicide with simazine or atrazine. Typical mixes are a three-way plus simazine or atrazine or Manor, Mansion or Blade plus simazine or atrazine. Apply early (between December and March 1) before the weeds get big.
