Weeds - how to kill onion weed infestation

by Tony Harris
(Forster NSW Australia)

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.

Comments for Weeds - how to kill onion weed infestation

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Mar 17, 2010
Onion weed Problem
by: Anonymous

I have the same problem !!
Would sure like a solution
Corydon Indiana USA

Mar 22, 2010
cure? worked for me
by: bill

Tried lots of things until an old timer told me to try WHITE VINEGAR! Put in a spray bottle and it really did work. GOOD LUCK

Mar 24, 2010
by: Tony Harris

If this works as you say I will be eternally grateful. I will replant the garden this weekend and if they do re-emerge I will be ready for them.Thanks again.

Mar 24, 2010
Onion Grass
by: Tony Harris

Try White Vinegar. I'm going to try it this weekend. Good luck.

Apr 27, 2010
try this
by: bill t.

I applaud those who suggest white vinegar sounds like a workable solution. Also if one uses a glysophate product it works better if a bit of vege oil is added to the mix. this helps the solution to stick to the leaf stems.Its also advisable to wait until the onion weed is actually flowering before spraying.Hope this helps, you have my sympathy with your problem but perseverance will win out.
Cheers bILL t. :)

Mar 20, 2012
Kill Oniongrass
by: Anonymous

Hand spray with 2-4 D. It will still take years because the oniongrass is perenial.

Mar 21, 2012
How to kill onion weeds
by: Nils

Is your garden small enough to do the no dig way?

Unless you've got lots of other plants in there, why don't you just smother the wretch bulbs, with thick loads of paper or cardboard, or dark plastic It might take a while but if you seal out light and air and water, they can't grow, ja?

Even if you use non-organic spray, you might stuff up the soil for planting later and there is still just the same chance that onion weed seeds from nearby?? will blow in later anyway. Just my 2 Euros worth, Nils

PS. I didn't shout about my objection to chemicals, but I might later! Another way to kill weeds too is by smothering with cast off carpet.

Oct 28, 2012
Onion Grass - White Vinager
by: Robert

If you spray with white vinager does it effect other nearby plants? Sounds like a good solution. Will the sprayed soil be ok for future use?

Oct 30, 2012
Vinegar as a weed killer
by: ~ Megan

Vinegar won't hurt surrounding plants unless they get splashed on, because it's only a contact weed-killer.

For how to use vinegar and other solutions for weeds, including onion weeds, you really need to read Organic Weed Control

Apr 19, 2019
onion weeds
by: Eileen

I dump boilging water on the roots left after I dig the plant-it helps a lot,but I'm still dealing with this problem yearly

Apr 06, 2020
weed kill
by: Anonymous

covering the weed will not kill the other bulbs that are attached to the roots.
the same for all the other methods, there are only 2 ways and they are
1/ dig it out completely including all the attached bulbs, good luck with that.
2/ repeat indefinitely vinegar glyphosate or covering until all bulbs are dead
ps Ive tried all methods

Apr 20, 2020
Does vinegar work?
by: Anonymous

Question for the people who used white vinegar, does it really work? I honestly don't think white vinegar is strong enough to kill onion weed, but if you guys report back saying it works I will try it.

May 30, 2020
Be kind to our planet
by: Monique Frugier

glysophate products such as RoundUp are poisons to our planet, our animals, our kids, yourself and the future of all.Please mix 1 gallon white vinegar with 1 cup of of table salt &1tbsp salt & tbsp of liquid dish detergent.Please care for our future and the future of our children.

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