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- 1). Pull the onions out of the ground. Do this as soon as you see the wild onions starting to grow. Once they have reached their full height, they will be harder to deal with. You can use a garden tool, or simply pull with your hands. You may not get all of the root, but getting the stalks out is a good first step.
- 2). Treat them with herbicide. The herbicide 2,4-Dichlorophenoxyacetic acid, usually referred to as 2,4-D, has proven effective on wild onions. You can either paint the stems or spray them down. This will discourage the stems from growing back.
- 3). Repeat the above steps every year. Unfortunately, eliminating wild onions is best accomplished over time. Pull the plants out of the ground and spray the stems each year until the bulbs actually fail to sprout.
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