Corn speedwell is a winter annual that germinates in mid-fall. Speedwells have a short taproot to fibrous root systems and branching upright stems. The lower leaves are near round with toothed margins. The upper leaves are more pointed. The plant is covered with fine hairs. Corn speedwell flowers are small and white to blue in color. The flowers are found in the leaf axis and the seed develops into a distinctive heart shape. Corn speedwell is distributed throughout the United States.
Weed Photos: Courtesy of Dr. Lambert McCarty. Clemson University. Clemson, SC.
Chemical control may be needed to eliminate invading corn speedwell, especially in turfgrass areas which are thin, or in newly seeded areas. Use a selective post-emergence herbicide taking care to follow spray intervals for newly seeded areas. For optimum control, make herbicide applications to actively growing speedwell in the four leaf to flower stage.
PowerZone® Broadleaf Herbicide
Q4® Plus Turf Herbicide for Grassy & Broadleaf Weeds
SpeedZone® Broadleaf Herbicide for Turf
SpeedZone® Southern Broadleaf Herbicide for Turf
Super Trimec® Broadleaf Herbicide
Surge® Broadleaf Herbicide for Turf
Trimec® 1000 Low Odor Broadleaf Herbicide
Trimec® 992 Broadleaf Herbicide
Trimec® Bentgrass Formula Broadleaf Herbicide
Trimec® Classic Broadleaf Herbicide
Trimec® Encore® Broadleaf Herbicide
Trimec® Southern Broadleaf Herbicide for Sensitive Southern Grasses
TZone SE Broadleaf Herbicide for Tough Weeds