Answer: Wild onion can be problematic because it stores energy in a bulbous root system. The best course of action is to dig the plants out, roots and all, and then reseed. A thick, healthy lawn will crowd out potential weed pests. Instead of digging, you could use an herbicide containing glyphosate (such as Round-Up) to kill the weeds, but this product is non-selective and will kill any plant, including grass, that it touches, so use it carefully and protect the plants you want to save. Once you rid the area of wild onion, you can use a pre-emergent herbicide (such as Preen) to keep weed seeds from germinating.
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