What can be done to kill wild onions?
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Jma12015062
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https://www.gardeningknowhow.com/plant-problems/weeds/killing-wild-onions.htm
Keep digging them up.........
Dig them out or douse in boiling water or drown in vinegar.
https://www.gardeningknowhow.com/plant-problems/weeds/killing-wild-onions.htm
The best time to treat a wild onion or wild garlic infestation with herbicides is in November, with a second application in late winter or very early spring before the plant begins producing more bulbs in March. Be careful to apply the herbicide only to the garlic or onion plants, as it can also kill nearby plants.