Johnsongrass is a warm-season perennial grass weed that is hated by agricultural farmers due to the fact that its visibility reduces returns in corn, grain sorghum, soybean, cotton, and leguminous forages. The weed gained its surname from a farmer who presented the types to his farm in Alabama in 1840s, Colonel william Johnson. Now, Johnsongrass is uncovered in almost every state in the country except for Minnesota and has to be labeled a noxious weed in 19 states.

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Johnsongrass is indigenous to the Mediterranean and also was initially introduced to phibìc America in 1830 together a forage crop and for stability ditches. Since then, it has actually been an eyesore and also headache to remove for farming and residential locations because that its tendency to group out preferable plants and also destroying food and shelter because that wildlife.

A single plant of Johnsongrass can create over 5,000 seed which have the right to lay dormant for up to 20 years. This weed is especially tough due to the fact that it have the right to be poisonous come cattle and horses. If you get very early frost or severe drought, you cannot let cattle and horses graze on any type of johnsongrass because it contains enough hydrogen cyanide to actually kill cattle and also horses which can be a major worry.

Our lawn care experts have actually put together this overview to present you specifically what you must remove Johnsongrass native your residential or commercial property permanently. Follow our step-by-step instructions below and also use our recommended commodities to the next to be successful in gaining rid of Johnsongrass.


Before you can bring out treatment applications, you should identify and be sure the weed friend are taking care of is Johnsongrass and also not some various other weed. Misidentification can lead to picking the dorn herbicides, which have the right to be a waste of time and also money.

Johnsongrass have the right to be failure with comparable perennial grasses prefer Vaseygrass and also Guinea Grass. The distinction with Johnsongrass is that Johnsongrass is a vigorous, coarse, perennial grass v scaly root stalks.Johnsongrass reproduces by underground rhizomes and seeds. Johnsongrass leaves are large and deserve to grow between 3 to 6 feet tall.The assorted seeds the Johnsongrass grow in the loss can it is in yellow to purplish in color, appearing out of a spread out out, open up seedhead.

Use ours description and also image over to aid you to determine Johnsongrass correctly. If you are not certain whether the weed on her lawn is Johnsongrass, contact us and also we will correctly ID the plant for you as well as give friend product references for control.


Once you have shown that you are dealing with Johnsongrass, you have the right to then bring out one inspection. During this phase, you will need to situate the areas where Johnsongrass is cultivation most and analyze the problems that room conducive to Johnsongrass growing in the area. This will assist you to recognize your therapy approach and also where to focus herbicide applications.

Where come Inspect

Johnsongrass often appears in soil that has been disturbed in ~ the edges of flowerbeds or in recently planted lawns. That can additionally grow along irrigation ditches or present bottoms; and along roadsides or cracks in between sidewalks.

What come Look For

Note where the Johnsongrass is growing and how large of a problem you have before proceeding with control alternatives which might be a combination of cultural and chemical control methods.


Before chemical application, you re welcome make certain to equip yourself with an individual protective devices for your personal safety (Glasses, gloves and also particle mask).

We recommend attacking the Johnsongrass early, prior to the summertime, as soon as the expansion of the plant is still energetic and prior to it it s okay to the seedling stage. We recommend applying Certainty Herbicide, i beg your pardon is labeled to act Johnsongrass and also other perennial and annual grasses.

Step 1: Mix and also Apply Certainty Herbicide


Certainty Herbicide is a selective, post-emergent herbicide meaning that the will just target the weeds on the label and also not cause any harm come your desired grasses. It come in water dispersible granule kind and comes through a practically measuring scooper for an exact measuring.

Before mix Certainty into your sprayer, determine just how much Certainty you need by measuring the square clip of your target area (measure and calculate the size of her lawn x width).

For general spot treatments, you have the right to treat 1,000 sq. Ft. By making use of a 0.75 to 1.25 ounces the Certainty (3 come 5 little scoops) in 2 gallons of water. For acerage applications, apply 1.25 to 2.0 oz. Of product every acre. If you space using the rate 1.25 oz. Every acre climate a second application might be do 4 or more weeks after first application.

A an excellent tool to usage to help with your herbicide application is mixing your selected herbicide with a surfactant like Alligare 90 so that your application deserve to stick come the Johnsongrass and not runoff. The label claims to include 2 teaspoons (1/3 fl. Oz.) the nonionic surfactant every gallon that water. Fill your sprayer 3/4ths that the means with water then add in the ideal amount of Certainty then to fill the rest of the way with water and add in the surfactant close to the finish of the filling and shake the sprayer.

Once the product is well-mixed in her sprayer, use the product come the Johnsongrass using a fan nozzle setting. This will shoot a mist that will certainly evenly cloak the Johnsongrass.

After applications room made, us recommend drowned the Johnsongrass with at least 2 customs of water together this deserve to kill the rhizome network underneath the soil. Shading and also baking the johnsongrass under a tarp can also be a good assist to the use of herbicides.

We recommend follow up applications after ~ 4 or an ext weeks till the Johnsongrass is fully dead.



If you"ve successfully been maybe to eliminate Johnsongrass, girlfriend will want to make sure it doesn"t make a return. The seeds of Johnsongrass that space missed during the herbicide applications deserve to remain viable for as long as 10 years so it is finest to avoid the seed from being spread to begin with via methods such together tilling the soil. Doing so will lug up the rhizomes and also seed heads of Johnsongrass therefore they have the right to be disposed of.

Aside native this, the finest defense against Johnsongrass is keeping your turf thick and also healthy come discourage undesired tree from establishing. Mow in ~ the right elevation and resolve any bare spots or thinning via reseeding. If your lawn is lush and strong it will outcompete weeds like Johnsongrass.

Key Takeaways

What is Johnsongrass?

Johnsongrass is an aggressive perennial weed the is recognized to it is in resistant come herbicide treatments and can get out of regulate in a hurry.

How to eliminate Johnsongrass

We recommend either using a post-emergent treatment of Certainty Herbicide to eliminate Johnsongrass.

Preventing Johnsongrass Reinfestation

To avoid a return the Johnsongrass, it rotates the soil and keep up a great lawn maintain schedule that will promote a thick, healthy lawn.

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A great tool to use to help with your herbicide application is mixing your selected herbicide v a surfactant so that your application deserve to stick come the Johnsongrass and not runoff.