Preplant Herbicide Restrictions

Alfalfa crops are sensitive to many herbicides used on common rotational crops.


Highlight the following considerations about weed management on rotational crops for growers.

  1. Some crop rotation restrictions can be as long as 24 months after herbicide application, so growers should review product labels prior to application and plan their weed management accordingly.

  2. Failing to meet the appropriate alfalfa planting interval after applying herbicides may result in poor stand establishment due to residual herbicide damage.

  3. The alfalfa rotation interval for many herbicides applied to corn, wheat or other small grains is presented in the tables in the document linked below.

For exact timing on planting following herbicide applications, visit this page. 

Privacy and Terms

For the 2020 growing seasons, growers must direct any product produced from HarvXtra® Alfalfa with Roundup Ready® Technology seed or crops (including hay and hay products) only to US domestic use. It is a violation of national and international law to move material containing biotech traits across boundaries into nations where import is not permitted. Growers should talk to their product purchaser to confirm their buying position for this product.

Due to factors outside of Forage Genetics International’s (FGI) control, such as weather, crop production patterns, and other factors, results to be obtained, including but not limited to yields or financial performance, cannot be predicted or guaranteed by FGI. Results are based upon FGI controlled tests and field trials and public trials. Results may vary.

ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. Roundup Ready® crops contain genes that confer tolerance to glyphosate, the active ingredient in Roundup® brand agricultural herbicides. Roundup® brand agricultural herbicides will kill crops that are not tolerant to glyphosate. Roundup Ready® and Roundup® are trademarks of Monsanto Technology LLC, used under license by Forage Genetics International, LLC. HarvXtra® is a registered trademark of Forage Genetics International, LLC. HarvXtra® Alfalfa with Roundup Ready® Technology is enabled with Technology from The Samuel Roberts Noble Foundation, Inc.

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