Answer: A thicker stand of healthy grass, will hinder the spread of violets and other lawn weeds. Wild violets are a very common lawn problem. They spread by underground bulblets and seeds, and any thin areas of lawn are subject to their invasion. You can dig out small patches by hand, but for larger areas, you may have to apply an herbicide such as Roundup to kill all the vegetation and start all over again. In spring, reseed the area. Keep the new lawn well watered, and fertilize in the spring after four or five mowings and the fall with a fertilizer that has a 2:1:1 nitrogen to phosphorus and potassium ratio, such as 10-5-5. To keep the lawn thick and prevent violets from moving in again, mow the grass three inches tall all summer. In late August, loosen any thin areas with a lawn rake and overseed them.
Best wishes with your lawn.
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