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How to Get Rid of Barnyardgrass

Barnyardgrass is a particularly difficult summer weed to control because it has multiple germinations or cohorts. A fast grower that is known to spread over lawns and gardens quickly, barnyardgrass has given lawn owners and many of our customers fits when it comes to controlling the weed when it gets out of hand.

The experts here at Solutions Pest and Lawn have done the research and trials to find the best method and herbicide application for this hard to manage weed and here we will share with you what we have learned so you can eradicate this pesky invader from your lawn.

Barnyardgrass background Information

Barnyardgrass (Echinochloa crus-gallia) enjoys the condition of moist soils and grows in both cultivated and uncultivated areas. It is often found in rice, corn, orchard, vegetable and other agricultural crops. It can also be found in moist turf areas and marshes. This grass spreads by seed and grows in clusters where it roots and branches at the lower joints. Mature plants can reach heights up to 5 feet. Stems are smooth and stalky and flat near the base of the plant. Leaves are smooth but may be rough closer to the tip.

This summer annual weed is easy to identify by its unique seedhead, which is usually purple with a bristle at the end which can vary from 2 to 8 inches in length. Seeds develop on side branches. Barnyardgrass weeds bloom from June through October, seeds are flat on one side and round on the other. This weed may produce more than 2,400 pounds of seeds per acre. The wind, water, animals, and humans may spread the seed to other areas. Barnyardgrass is a vigorous grower and quickly removes vital nutrients such as potassium, nitrogen and phosphorus from the soil so if it grows onto your lawn, you have to act fast to control it before it zaps the lawn of all of it’s nutrition.

How Best Way to Control Barnyardgrass

Recommended Pre-emergent and  Post-emergent Herbicides:


Barnyardgrass weeds can be annoying when they appear in lawns or garden areas. Control of barnyardgrass in turf should involve a combination of both chemical and cultural practices. If you keep your lawn healthy with proper mowing and fertilization, there will be very little room for the pesky grass to grow. Barnyardgrass can show resistance to common herbicides. Based on trials that we have done the above herbicides are the most successful in treating barnyardgrass. Repeated application may be necessary so don’t assume that things will be “one and done”.

Timing and persistence is important when it comes to treating hard to manage weeds such as barnyardgrass. For best control, make sure to treat barnyardgrass early and often. Well-timed early season applications, using multiple pre-and postemergence herbicides with different modes of action, provide the most consistent weed control and will do the most to discourage the weed from developing a resistance.

Barnyardgrass Treatment Tips and Recommendations

  • Want to achieve the best possible results in your herbicide treatment application? Use a surfactant  and mix it with your selected herbicide to combat surface tension and runoff when spraying your targeted barnyardgrass weeds.

  • Excessive spraying could burn your grass. Make sure to not overspray by using a spray pattern indicator so you can mark where you have sprayed.

  • Herbicide chemicals have the potential to harm or irritate skin on contact. When handling any weed killing chemicals be sure to wear the right protective equipment to cover your skin, eyes, nasal openings and mouth.

  • Are you a more visual learner? We have informative How-To Videos which show you step-by-step what to do and how to properly apply herbicide to a variety of weeds.

For more information on controlling barnyardgrass on your lawn and to get advice catered to your unique issue from experts, contact us at askapro@solutionsstores.com or call our customer service line at (800) 479-6583.

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