There is no treat-and-forget solution where it has been well-established in a lawn. It requires constant vigilence like being a lawn security guard. I've tried the oxalis-destroyer but fear it has made matters worse. The problem is that the chemical stresses out the lawn grass while it is attempting to control its targeted foe and a stressed lawn makes it that much easier for any weed to take hold. So you may need to just live with a slightly brown lawn until the violets have succumbed. Fall treatment followed by the following Spring is the best success and figure on a few years followed by close monitoring and more treatments when new eruptions occur. Use a surfactant to help break the wax (yes, the violet leaves have been preparing for our attack for thousands of years). And before you violet sympathizers begin to suffer the effrontery of eradicating this natural botanical... try to understand and sympathize with the lawn maintainers. Homeowners who spend years planting and caring for a lawn (in this context, "lawn" means grass!) resent any invader that seeks to undo all their efforts and expense which created the lawn in the first place. It's not the occasional tuft of violets that is at issue but rather an entire lawn covered to the point where the grass has been all but eliminated. If we wanted a field covered with violets we would have planted them in the first place. And trying to bag clippings is near impossible because violet leaves do not shear like grass and discharge through the chute. They create a slurry of green sludge that must be removed from the bag by hand or with a trowel. There is a difference between coexisting and invading. Wild violets are about as invasive a weed as there is and confounds lawn care all over the country. They have ceased to be "cute" additions to a cultured environment.

I have TONS of the purple, quite a few of the blue and white, and an probably find a few of the yellow.

Hello! If you are still looking for violets to trade for herbs, I would be able to trade lots of yellow violets in the spring - probably May or so before they will be up. What types of herbs do you have? I am only interested in perennial herbs. Maybe we can do a trade in May. Let me know if you are interested in my yellow violets, thanx!

Palmata ?