Roundup WeatherMAX® herbicide is the preferred brand for customers who want unsurpassed performance to control their toughest weeds in tough conditions. Roundup WeatherMAX® is the best choice for any situation. Growers can count on Roundup WeatherMAX® to perform and have confidence in their decision, knowing that Monsanto stands behind every jug with the RiskShield® Protection Package.

Roundup Weathermax® Herbicide

Growers across the prairies told us they prefer Roundup WeatherMAX® for:

  • Proven crop safety
  • Unparalleled support
  • Unsurpassed and consistent weed control under ideal and tough conditions
  • Superior rainfastness – 30-Minute Rainfast Guarantee
  • Enhanced efficiency with up to 33% less product to handle than some imitator

Roundup WeatherMAX® herbicide penetrates the weed leaf within minutes and drives all that power down into the roots. Giving growers the confidence to spray when conditions are ideal – and even when they’re not. In fact, Roundup WeatherMAX® is backed by an industry leading all weather warranty and a 30-Minute Rainfast Guarantee. Now you have more power than ever before in all conditions.


You can always rest easy with Roundup WeatherMAX® because you have access to the added benefits of RiskShield® Protection Package. The Roundup WeatherMAX® 30-Minute Rainfast Guarantee, the All Weather Warranty, the Crop Safety Guarantee and the Crop Establishment coverage will provide you the backup you need.


Farmers and retailers have proven that Performance, Support and Quality matters as it pays to get it right the first time, especially in variable and uncertain conditions. You can count on Roundup WeatherMAX® to be the choice for farmers who want to know they will get unsurpassed performance on tough weeds in tough conditions. 


  One 10L jug of Roundup   
0.33 L/acre 30 acres 
0.50 L/acre 20 acres
0.67 L/acre 15 acres
0.83 L/acre 12 acres 
1.00 L/acre 10 acres
1.17 L/acre 9 acres
1.33 L/acre 8 acres

Monsanto Company is a member of Excellence Through Stewardship® (ETS).

Monsanto products are commercialized in accordance with ETS Product Launch Stewardship Guidance, and in compliance with Monsanto’s Policy for Commercialization of Biotechnology-Derived Plant Products in Commodity Crops. These products have been approved for import into key export markets with functioning regulatory systems. Any crop or material produced from these products can only be exported to, or used, processed or sold in countries where all necessary regulatory approvals have been granted. 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 grain handler or product purchaser to confirm their buying position for these products. Excellence Through Stewardship® is a registered trademark of Excellence Through Stewardship.


Roundup Ready® technology contains genes that confer tolerance to glyphosate, an active ingredient in Roundup® brand agricultural herbicides. Agricultural herbicides containing glyphosate will kill crops that are not tolerant to glyphosate. DEKALB and Design®, Genuity and Design®, Monsanto and Vine Design®, R/T 540®, Roundup Ready®, Roundup Transorb®, Roundup Ultra2®, Roundup WeatherMAX®, Roundup® and Transorb® are registered trademarks of Monsanto Technology LLC, Monsanto Canada, Inc. licensee. All other trademarks are the property of their respective owners. ©2016 Monsanto Canada Inc.