AFX 455HVX HarvXtra® Alfalfa Seed

HarvXtra® Alfalfa with roundup ready technology    Roundup Ready® Alfalfa

PERFORMANCEAlfalfa Technology Sheet PDF Download Button

  • AFX 455-HVX is a HarvXtra® alfalfa variety used to produce the highest quality alfalfa forage in the industry
  • Strong disease resistance package and is very winterhardy
  • High yield potential in multiple growing environments



  • Early season weed control with glyphosate herbicides helps improve establishment success and first year yield potential compared to conventional varieties
  • Choice of delaying cutting by 7-10 days or cutting for highest RFQ



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Yield Rating Key: 5 = Best; 3 = Average; 1 = Poor

Agronomic Yield Ratings are based on average performance between Alforex varieties. Actual performance may be adversely affected by extreme conditions. Unless stated, ratings are based on standardized testing procedures endorsed by the North American Alfalfa Improvement Conference.

FastGrowth Ratings are calculated by Alforex Seeds from weekly measurement of varieties grown side-by-side from green-up to harvest through the growing season. Expressed as average centimeters growth per day.  >2.20 = Very Fast; >2.00 = Fast; >1.80 = Average; >1.60 = Slow; <1.60 = Very Slow

Pest Resistance Ratings


IMPORTANT: Agronomic ratings based on period-of-years testing through 2018 harvest. Pest resistance, dormancy, winter survival and winterhardiness ratings based on standard test protocols prescribed and endorsed by the North American Alfalfa Improvement Conference (NAAIC) and were the latest available at the time of the publication. Ratings may change over additional years of data collection, or if NAAIC protocols change. Contact your sales professional before planting for the latest trait rating information. 

DISEASE RESISTANCE INDEX: DRI is a disease index based on the following pests: Bacterial wilt, Verticillium wilt, Fusarium wilt, Anthracnose, Phytophthora, and Aphanomyces (Race 1 and Race 2). HR = 5 points, R= 4 points, MR = 3 points, LR = 2 points, S= 1 point. Highest possible DRI = 35 points.

Herbicide Resistance: Alway Read and Follow Pesticide Label Directions. Roundup Ready® Alfalfa (RRA) products and/or HarvXtra® Alfalfa with Roundup Ready Technology (HVX) contain genes that confer tolerance to glyphosate. Alfalfa with the Roundup Ready® technology provides crop safety for over-the-top applications of labeled glyphosate herbicides when applied according to label directions. Glyphosate agricultural herbicides will kill crops that are not tolerant to glyphosate. Accidental application of incompatible herbicides to these alfalfa varieties could result in total crop loss. HVX alfalfa products contain the biotechnology-derived trait developed to maximize alfalfa quality compared to commercially available alfalfa products harvested at the same growth stage, by reducing the amount of lignin in the plant.

Do not export alfalfa seed or crops containing Roundup Ready® and/or Alfalfa with HarvXtra® Technology, including hay or hay products, to China pending import approval. In addition, due to the unique cropping practices, do not plant this product in Imperial County, California. Crops and material containing biotech traits may only be exported to, used, processed or sold in jurisdictions where all necessary regulatory approvals have been granted for those crops and materials. It is a violation of national and international law to move materials containing biotech traits into jurisdictions where their import is not permitted. Growers should discuss these issues with their purchaser or grain handler to confirm the purchaser or handler’s position on products purchased. For further information on the approval status of biotech traits, please visit

HarvXtra® is a trademark of Forage Genetics International, LLC. HarvXtra® Alfalfa with Roundup Ready® Technology is enabled with technology from The Samuel Roberts Noble Foundation, Inc. Roundup Ready® and Roundup® are registered trademarks of Monsanto Technology LLC, used under license by Forage Genetics International, LLC.

CORTEVA Agriscience™® Trademarks of Dow AgroSciences, DuPont or Pioneer, and their affiliated companies or their respective owners. © 2019 CORTEVA.