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What you probably have isWhat you probably have is wild onion or wild garlic in your yard. Mowing will not kill them though regular mowing can weaken plants and prevent them from setting seed. You need to treat them with an herbicide in in November and again in late winter or early spring before these plants can produce the next generation of bulbs in March. Special to your local garden center about herbicides approved in your area for wild onion and wild garlic.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?