Ask a Question forum→herbicide ineffectiveness

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Brooks, Alberta
May 21, 2020 4:02 PM CST
Hi all

For the last long while it doesn't seem to matter what herbicide I use whether it be Roundup or Killex it just doesn't kill the weeds that are sprayed. They sicken but don't die. I am carefull to make sure that the mixture is correct and I have tried dish soap as a surfactant but no luck. I have tried making it stronger. I have purchased new stuff thinking that maybe the product has a shelf life. Nothing works. It hasn't always been this way. Years ago if you sprayed a weed it died completely. So this is a bit perplexing. Any ideas as to what's going on?


Name: Big Bill
Livonia, Michigan (Zone 6a)
American Orchid Society Judge
Region: United States of America Critters Allowed Growing under artificial light Echinacea Hostas Region: Michigan
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May 21, 2020 4:12 PM CST
I use Roundup infrequently and it comes already mixed. It has a hose and a nozzle to direct the spray.

The commercial claims aside, weeds with deep tap roots like a thistle or dandelion do not die in one application. They come back from that tap root. You will have to hit them a couple of times.
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Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
May 21, 2020 4:37 PM CST
The weeds are becoming resistant. Spray them two or three times. Plants with waxy coatings can't be killed with roundup.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

President: Orchid Society of Northern Nevada
Name: Carol
Santa Ana, ca
Sunset zone 22, USDA zone 10 A.
Charter ATP Member Bookworm Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California
Plant Identifier
May 21, 2020 5:09 PM CST
What Daisy said is correct, but yes, it does have a shelf life too. It works on ACTIVELY GROWING young weeds, and if weather is not ideal for growing, it will require repeat spraying.

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