How to kill johnson grass?

Answer 1

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

Answer 2

Johnson grass—also spelled as one word, Johnsongrass—is an invasive species that takes over a lawn, garden or field in a relatively short period of time. Johnson grass is not difficult to kill, but it is an annoyingly tough plant that can be hard to pull out. Johnson grass not only kills other plants, but it can be harmful to cows if they eat too much of it. 1. Mow the Johnson grass as low as possible. Keeping the grass well-mowed will kill the rhizomes and seeds so that it cannot reproduce. When mowed to low levels, it is easier to completely kill and remove from the soil. 2. Spray Johnson grass with herbicides. Regular herbicides found on the market can kill Johnson grass. Mix and apply the herbicide following the directions on the herbicide container and allow it to work. More than one application may be required. Spray the herbicide in late summer to have the best results. 3. Pull the plant out of the ground, including the roots and rhizomes. The entire plant should be pulled out. Wear gloves to prevent injuries or skin reactions to remaining herbicides. Pulling the plant should be done in small sections. Tips & Warnings In areas where there are heavy infestations of Johnson grass, avoid pulling the plant and use a till instead. Tilling the soil will have a similar effect, but it will not take as long. Check state and local laws regarding herbicide usage. Most states require only the appropriate usage according to the label, but some states have laws relating to which herbicides can be used and how they should be used.

Answer 3

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.

Answer 4

Dig them out and don't leave the fine roots. the little ones come out easy getting a shovel under them . the large ones just peck away a little every other day and soon you will have your space back. I shake all the dirt off or hit the root ball on a tree trunk. Lay them on string cut to tie them up . Usually 2 strings sometimes doubled up and haul to the curbside.
Spraying has become to risky especially herbicide and pesticides. You should always wear a mask spraying. Even insecticidal soaps are harmful to inhale with swirling wind.

Answer 5

It would probably take full strength Round-up. That is the hardest grass I have ever seen to get rid of.

Answer 6

I HAVE HEARD THAT VINIGAR AND SUGAR WILL KILL JOHNSONGRASS