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Avatar for jturuk
May 21, 2020 4:02 PM CST
Brooks, Alberta
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?

Thanks

John
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May 21, 2020 4:12 PM CST
Name: Big Bill
Livonia Michigan (Zone 6a)
GROW ORCHIDS!!!
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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.
Orchid lecturer, teacher and judge. Retired Wildlife Biologist. Supervisor of a nature preserve up until I retired.
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May 21, 2020 4:37 PM CST
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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

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May 21, 2020 5:09 PM CST
Name: Carol
Santa Ana, ca
Sunset zone 22, USDA zone 10 A.
Bookworm Charter ATP Member Region: California Hummingbirder Orchids Plant Identifier
Lover of wildlife (Black bear badge)
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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