How to kill johnson grass?
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As the previous answers have suggested, Roundup does not do a very good job controlling Johnson Grass. Many tests have been conducted and one of the best products available to homeowners to eliminate this weed successfully is called; Fusilade.which is sold at most hardware/garden shops as "Grass-B-Gone" by Ortho.
Simply follow directions and spray the entire weed. The label may ask that you mix in a "Spreader-Sticker" and I'd strongly recommend doing this in order to achieve the best results. The spreader-sticker simply allows more product to remain on the leaves and thereby getting more herbicide into the plant with minimal run-off.
NOTE: DO NOT apply this around lawns.
Hope this helps solve your problem. GOOD LUCK!
-Certified Professional Crop Consultant with over 30 years of experience and a Degree in Plant Science
It would probably take full strength Round-up. That is the hardest grass I have ever seen to get rid of.
That is an age-old question that I'm not sure there is a good answer to.
I can tell you that Round-up (and other products) will NOT work because they target broad-leafed weeds, not grasses. If you use enough of it.maybe, but you wouldn't want to do that.
Your best bet is probably to kill everything in that area and start over. Your options are either cover it and block the light to it with something like felt, or pour gas or diesel on it (not as environmentally friendly, but it will work).
To get rid of it, you'll have to get rid of everything in that area.
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