I have an onion weed infestation in my garden. I have sprayed round up on it and all the plants or leaves die off but every time I dig up the soil, they appear again. I was told that I could plant some other plant as a companion and that it would kill it. I would be very greatful for a positive answer as I cannot see any choice but to dig out all the soil and replace it at the risk of re-infesting the soil. A never ending circle.
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