- 1). Prevent growth of onion grass in the garden with a thick layer of mulch.
- 2). Dig up small infestations with a trowel, digging under the bulbs. Fortunately, the roots don't extend much below the bulb, which themselves are shallow.
- 3). Use any of the following as selective herbicides: imazaquin (Image brand), metsulfuron methyl (Manor brand), imazapic (Plateau brand), or 2,4-D. Follow the directions on the container for the amount to apply. "Selective" means that they will kill the wild onion but not your grass.
- 4). Repeat the application over multiple seasons, since the plant is perennial. Once in the late fall and once in the late winter is best. The fall application gets sucked into the roots, and the late winter application prevents bulb growth just before spring.
- 5). Fertilize your lawn with nitrogen in the fall to help your lawn out-compete the wild onion.
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