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Corn Speedwell is a winter annual broadleaf weed that is also referred to as Rock Speedwell, Wall Speedwell or its scientific name, Veronica arvensis.
Corn Speedwell can be identified by its ascending, branched stems radiating from the base of the plant. Its lower leaves, growing opposite from each other, are hairy with rounded teeth on the leaf margin. The upper leaves, growing alternate each from other, are much smaller than the lower leaves and have fewer teeth. This broadleaf weed has a fibrous, shallow root system. In bloom, Corn Speedwell features small, pale-blue to white-colored flowers that can be found in the leaf axis. Corn Speedwell reproduces with another useful identifier: distinctively heart-shaped seeds.
This broadleaf weed grows in rocky glades, fields, barren wastelands, grassy areas and alongside roads. However, disturbed areas are preferred, including lawns and gardens. Corn Speedwell thrives throughout most of the United States.
Veronica arvensis cannot thrive in a thick, dense grass, so regular lawn management and cultural practices—such as proper watering and mowing routines—can be effective at keeping this broadleaf weed in check.
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