Skip to main content
Customize by ZIP Code

User account menu

  • Help Center
Menu Search
Home Home
Roundup

Main Navigation (US)

  • Products

    • Landscape Weeds

    • Driveway & Patio Weeds

    • Lawn Weeds & Bugs

    • Poison Ivy & Tough Brush

    • Concentrates

    • Refills

  • Product Picker

  • Weeding Wisely

    • Learning the Basics

    • Using Products Properly

    • Specific Weeds

    • Learning the Basics

    • Using Products Properly

    • Specific Weeds

    • General Weeding

    • Landscape Projects

  • Help Center

    • Email Us

    • Site Map

    • Terms & Conditions

    • About Us

Search

FREE SHIPPING ON ORDERS $35 OR MORE

weeding wisely banner

Specific Weeds

What Is Johnsongrass and How Do I Control It?

Here are a few tips for getting rid of this big meanie.

Johnsongrass growing in a lawn.

“Sorghum halepense plant2” by Macleavy Grass Man is licensed under CC BY 3.0 US

Illustration of johnsongrass.

WHAT IS JOHNSONGRASS?

Johnsongrass is a burly bully that can reach eight feet tall and produce thousands of seeds per year. It’s particularly adept at taking over landscapes. Here are a few tips for getting rid of this big meanie.

HOW TO PREVENT JOHNSONGRASS

To keep johnsongrass from wreaking havoc in your landscape, apply Roundup® Landscape Weed Preventer in the spring. It forms a weed barrier to prevent johnsongrass weed seeds—not to mention other listed grass and broadleaf weed seeds—from sprouting and growing for up to 6 months. When used as directed, it won't harm the plants you actually want to keep.

HOW TO KILL JOHNSONGRASS

Before the weed produces a seed head in July, apply Roundup®Ready-To-Use Weed & Grass Killer III. It works wonders on johnsongrass because it gets down to the root. As always, remember not to spray it on the plants you like, as Roundup® Weed & Grass Killer products work on any plants they come in contact with.

AVOID HAND PULLING

As with many weeds, pulling out johnsongrass by hand can break the roots. And those obnoxious roots will simply grow back.

HISTORICALLY HAZARDOUS

In 1830, johnsongrass was introduced to the United States as a forage crop. Nowadays, you’ll find it in many parts of the world, crowding out desirable plants, destroying food and shelter for wildlife, and causing trouble for farmers and ranchers.

5200510_no_clip.eps_Transparent_png.png
Roundup® Ready-To-Use Weed & Grass Killer III with Sure Shot® Wand
Learn More
Jug of Roundup® Ready-To-Use Weed & Grass Killer III with Comfort Wand®
Roundup® Ready-To-Use Weed & Grass Killer III with Comfort Wand®
Learn More
Bag of Roundup Weed Preventer
Roundup® Landscape Weed Preventer
Learn More

Related Articles

Whether you are just starting out, maintaining or troubleshooting, you'll find advice and answers here for all your weed control needs.

Roundup® Weed & Grass Killer Products Control over 200 species of weeds.
Related Article
What Do Roundup® Weed & Grass Killer Products Control?

We know of over 200 types of weeds and grasses that our products can help you handle.

Learn More
Monkeygrass growing in a lawn.
Related Article
What Is Monkeygrass and How Do I Control It?

Monkeygrass is the name for two similar plants that are popular for borders and ground cover. These grass-like plants are extremely versatile. 

Learn More
Man using a Sure Shot® Wand.
Related Article
Tips for Using the Sure Shot® Wand and Comfort Wand®

Troubleshooting tips and tricks for how to properly use the Sure Shot® Wand and Comfort Wand®.

Learn More
2021-03-04
2021-03-04
Roundup
85
77
/en-us/library/specific-weeds/what-johnsongrass-and-how-do-i-control-it
https://www.roundup.com/sites/g/files/oydgjc121/files/styles/large/public/asset_images/templateFramework/images/microSites/RUP/weedingwisely/article_assets/feature/44100017.jpg?itok=pSQUZ1X6

Social Media

  • Youtube

Footer menu

  • General Conditions of Use
  • Privacy Statement
  • Return Policy
  • Contact Us
  • Site Map
  • The Scotts Miracle-Gro Company
  • Investor Relations
  • Our Brands
  • Careers

The information on this site refers to Roundup® Weed & Grass Killer products and is for homeowner use. Always read and follow label directions.

*Consumer Guarantee: If for any reason you are not satisfied after using this product, simply send us original proof of purchase, and we will refund the purchase price.

Always read and follow label directions. Roundup, Roundup & design, FastAct, Roundup Extended Control and X design, Roundup® Precision Gel™, Pump 'N Go, Sure Shot and Draw the Line are trademarks of Monsanto Technology LLC. © 2021 Monsanto Company, worldwide rights reserved.