Top Questions About Johnson Grass

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Questions About Johnson Grass

Asked by
kurosawa on
July 27, 2011

Q. Lime painted rock and pebbles

Will rocks and pebbles painted with lime prevent Johnson grass and other bad weeds from growing in a Japanese rock garden?

Answered by
Cathy on
July 30, 2011
A.

No, lime effects pH, it does not have any effect as a grass killer. You could apply weed killer with a paint brush to help get it under control. But you will have to be very careful with the application.

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Asked by
Spencer Arthur on
October 27, 2014

Q. How do you kill Johnson grass

Name a product that can be used to kill the Johnson grass.

Answered by
theficuswrangler on
October 28, 2014
A.

There is no magic potion for johnson grass eradication, but it can be done with some persistent effort. This article will tell you more: https://www.gardeningknowhow.com/plant-problems/weeds/controlling-johnson-grass.htm

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Asked by
anne.vosper on
April 4, 2015
Northern Tablelands nNSW

Q. Is Johnson grass poisonous to cattle?

Got some seed from for my canaries and thought about planting some in my garden but I don’t want it to spread to the paddocks if it is poisonous to cattle.

Answered by
shelley on
April 4, 2015
Certified Expert
A.

Johnson grass can be toxic to our livestock, but only under certain conditions. It produces a toxin, prussic acid, when it is under stress (such as drought, freezing weather). More information can be found here:

http://wilkes.ces.ncsu.edu/2014/10/johnsongrass-in-pastures-can-be-toxic/

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Asked by
Anonymous on
July 23, 2015

Q. Burr Weeds and Johnson Grass

My yard is infested with burr weeds and Johnston grass weeds. I keep pulling them out, but it seems they come right back! The Johnston grass grows right at the edge of the chain link fence so it’s hard to get the roots for fear of breaking the bottom line. How can I get rid of these two invaders once and for all? Thank you!

Answered by
Downtoearthdigs on
July 24, 2015
A.

Spot treating the weed with vinegar, boiling water, or Round-up may help. Also, for the burr weeds, this article may have some suggestions: https://www.gardeningknowhow.com/plant-problems/weeds/burr-medic-weed.htm

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Asked by
bcs81 on
July 9, 2017
Breckenridge, Texas zone 7B

Q. Johnson grass

I have Johnson grass growing in a water front yard near the edge of the lake. What is the best method to get rid of it? I am concerned about using herbicides that close to the water.

Answered by
Downtoearthdigs on
July 11, 2017
A.

You may want to check with your County Extension Office to find out the safest way to treat and remove this grass near a water source.
Here are some links to help you.
https://www.gardeningknowhow.com/extension-search/

https://www.gardeningknowhow.com/plant-problems/weeds/controlling-johnson-grass.htm

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Asked by
nanainaustin75 on
September 5, 2019
Zone 9

Q. What is the best way to treat invasive Johnson Grass?

I live in a gated community where it is taking over large areas of grass.

Answered by
GKH_Susan on
September 8, 2019
Certified Expert
A.

Herbicides alone usually aren't enough to control Johnson grass. This article should help:
https://www.gardeningknowhow.com/plant-problems/weeds/controlling-johnson-grass.htm

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