If there is Wild Onion growing in your lawn, keep it cut very short (even if the grass doesn't need mowing). By keeping the leaves as short as possible, you are weakening the bulbs and preventing it from flowering (therefore no seeds).

Wild Onion will take over in a thin lawn, so improve your lawn and keep it dense. Dense healthy grass will help to choke out the Wild Onion.

You may need to use a postemergent herbicide for control in the early spring. The herbicide should be applied when the Wild Onion is actively growing and is 2 - 12 inches tall.

Do not hand pull the Wild Onion as the small bulblets may be left behind to continue growing. If you dig them out, remove some soil along with the bulbs to ensure none are left behind.

Good luck
Barb