Wild violet, according to the University of Nebraska-Lincoln, is a cool-season broadleaf weed. The wild violet plant grows between 2 to 12 inches tall, with dense roots that are very invasive. The violet flowers are attractive, but when out of control they quickly overtake an area. They are drought tolerant and resistant to herbicides, due to a waxy coating on the plant, so it takes several applications of herbicide to kill them completely.
Apply a herbicide containing dicamba or triclopyr, recommends Ohio State University.
Prepare to spray the herbicide in the spring and fall. This controls early wild violet growth and curbs reproduction in the fall.
Spray the herbicide directly onto the plants, spraying as close as possible to prevent the herbicide from spreading. If using granule herbicide, slightly wet the plants before applying. Wear protective clothing and eyewear when applying the herbicide. Follow all directions on the herbicide packaging.