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I have had onions growing in my yard for years, and every year there seems to be more and more of them. I always mow down the grass before the onion grass flowers, so I don't know how these things keep spreading.
I suspect they are windblown seeds, although wild onions do also reproduce by growing 'bulblets' alongside the main mother bulb.
In flower beds, I kill them like this;
I let the onions grow until there's about 4-6 inches above the flower bed foliage.
I mix up weed and grass killer.
I put on a nitrile glove, followed by a cheap jersey cotton glove that I've cut off the wrist collar.
I dip my gloved thumb and forefinger into the weed and grass killer, squeeze off excess, then grasp the onion stems and pull them through my fingers, roughly.
This method will also kill the bulblets, as they're connected to the mother bulb.
-Alto
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