Killing Purple Violets Without Killing the Grass
How can I get rid of those weeds? In the past, used Weed B Gone in 3 applications two weeks apart. Late summer. Killed the violets only on 3rd spraying. Grass & crocuses died as well. Now the violets are back worse than ever
District of Columbia County District of Columbia
Wild violets are tough perennial native plants and they are difficult to control. It thrives in lawns that are mowed too short and is common in thin lawns that are in poor condition. Wild violets also have some wildlife value. They are the larval food source for fritillary butterflies. Some decide to leave them.
Here is our page http://extension.umd.edu/hgic/wild-violet
and Tips for Prevention & Weed Management https://extension.umd.edu/hgic/topics/tips-lawn-weed-prevention-and-management
and the Challenges of Growing A Healthy Lawn https://extension.umd.edu/hgic/topics/challenge-growing-lawn-maryland
If you decide to try again with an herbicide, look for one that has triclopyr as the active ingredient. Spot-treat the violets with a liquid herbicide instead of treating your entire lawn. One that comes to mind is Ortho Chickweed, Clover, and Oxalis Killer.