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Spray Smarter, Know Your Options

Roundup® Herbicides

Roundup WeatherMAX® and Roundup Transorb® HC herbicides provide convenient, easy-to-use broad spectrum weed control even in tough conditions. Roundup herbicides come with some of the best guarantees in the industry, backed by years of top-tier research and development.

Why you should choose Roundup

With six decades of development and innovation behind them, Roundup herbicides are tried, tested and best of all – GUARANTEED. See how Roundup technology works – even on the toughest weeds.

Roundup Transorb logo
Roundup® WeatherMAX Herbicide with Transorb II Technology logo

Roundup WeatherMAX herbicide is the preferred product for customers who want guaranteed performance in a range of weather conditions.

WeatherMax offers:

  • Proven crop safety
  • Unsurpassed and consistent weed control under ideal and tough conditions
  • 30-Minute Rainfast Guarantee
  • All Weather Warranty
  • Enhanced efficiency with 540g/L formulation
  • Supported by Riskshield® protection package
Roundup Transorb logo

Roundup Transorb HC herbicide sets the standard in value, combining quality, performance and support at a lower cost to growers.

Transorb HC offers:

  • Unsurpassed weed control and consistency of control
  • Trusted performance
  • 60-Minute Rainfast Guarantee
  • All Weather Warranty
  • Enhanced efficiency with 540g/L formulation
  • Supported by Riskshield® protection package
riskshield protection package

When you use either Roundup WeatherMAX or Roundup Transorb HC herbicide you get the added peace-of-mind that comes with the Riskshield protection package.

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Decorative image of tractor at work in the field Decorative image of tractor at work in the field

The Roundup Advantage

When it comes to broad spectrum weed control, Roundup WeatherMAX or Roundup Transorb HC herbicides provide unsurpassed performance even in tough conditions. They’re convenient to use and come with the best guarantee in the industry. That’s the difference technology makes.

In addition to providing lower application rates and higher A.E., Roundup glyphosate-only agricultural herbicides offer different formulations to suit the specific needs of your farming operation.


The History of Roundup

The story starts some 60 years ago, with ongoing innovation and development ever since.

Photo of Monsanto sign


In 1960, an Agricultural Division is formed within Monsanto. In the mid-1960s, Monsanto established Monsanto Agricultural Centers, or MACs. They were retail operations, something new to Monsanto, and provided all the fertilizer and pesticides a farmer might need, including testing and product application to fields in some cases. MACs were phased out in 1975.

Photo of John Franz


A young chemist named John Franz, who had recently been transferred to the Ag division, began work with another scientist, Dr. Phil Hamm, the head of Monsanto's herbicide screening program. Hamm was excited about two compounds that had been recently submitted by chemists from another part of Monsanto, compounds that initially were studied as water softeners. Hamm wondered if there might be some use for the compounds as herbicides and asked Franz to study them.

Franz proceeded to study how these compounds metabolized within plants. He theorized that a beneficial compound might be produced during the plant's metabolic process, and if he was lucky, he might be able to synthesize one of these compounds. The third compound he synthesized would prove to be one that would change the face of farming. The molecule John Franz discovered was called glyphosate, the active ingredient in Monsanto's original Roundup® herbicide formulation.


In the early 1970s when glyphosate was first discovered, Monsanto marketers were perplexed. They were accustomed to selling herbicides that were selective, which killed certain weeds but left crops unharmed. Glyphosate was non-selective, killing virtually all plants with which it came in contact. But because it was environmentally friendly, marketers continued to try to find ways it could be used commercially.


Original Roundup brand herbicide commercialized in Malaysia and the UK.


Original Roundup brand herbicide commercialized for agricultural use in Canada.

Roundup logo

The original Roundup® herbicide allowed farmers to kill almost every weed that emerged from the soil, thus decreasing the need for tilling to control weeds and suffering soil erosion in the process. This Roundup® product also seemed to be the perfect environmental solution at the perfect time. It was found to decompose into natural products — carbon dioxide, phosphoric acid, and ammonia — and was also found to be safe for humans and wildlife. Environmentally speaking, the original Roundup herbicide proved to be one of, if not the safest, herbicides in history.

Late 1970s

In 1970 most farmers believed they had no choice but to use herbicides and tilling to control weeds. At the time, most herbicides were pre-emergent, meaning they created a chemical barrier on the surface of a field and killed weeds when they sprouted through this barrier and came in contact with the herbicide. To be effective, pre-emergent herbicides had to spread when they were applied to fields, ensuring a consistent, even barrier against sprouting weeds. They also needed to stay active for a long time so they would continue to be effective after the spring rainy season. These two common traits were environmentally problematic because active pre-emergent herbicides could wash into streams and ground water, potentially effecting wildlife and fish. The original Roundup® herbicide was different, becoming one of the most environmentally friendly herbicides in the history of agriculture.


Starting in the early 1980s, Monsanto began to invest heavily in a new science called biotechnology. The company built new labs, hired new scientists, performed year upon year of research and spent billions of dollars chasing a dream.


Original Roundup brand herbicide named by Farm Chemicals Magazine as one of the “Top Ten Products that Changed the Face of Agriculture.”


Roundup Ready Canola is introduced in Canada. This technology changed the face of Western Canadian agriculture and was a catalyst in the success of the Canadian canola industry.

Roundup Ready Canola logo


Roundup Ready Soybeans are introduced in Canada, providing farmers with in-seed herbicide tolerance to Roundup and other glyphosate-based herbicides.

Roundup Ready Soybeans logo


Roundup WeatherMAX is introduced for sale in Canada.

Roundup® WeatherMAX Herbicide with Transorb II Technology logo


Dr. John Franz is introduced into the National Inventor’s Hall of Fame for his invention of glyphosate.

Roundup Transorb HC is introduced for sale in Canada.

Roundup Transorb logo
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