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Product Overview

Up to 8 months of selective, preemergence weed control.

Key Benefits

  • Long-lasting control reduces labor and eliminates repeat applications
  • Labeled for use on over 115 ornamental crops
  • Broad-spectrum control of over 70 different weeds means fewer escapes and fewer cleanup applications
  • Effective on hard-to-control weeds such as eclipta, bittercress, groundsel, oxalis, marestail, spurge, crabgrass and annual bluegrass
  • Spring or fall application flexibility to meet unique grower needs
  • Labeled for preemergence weed control inside greenhouses beneath benches

Marengo Cost-In-Use 
No product lasts longer than Marengo, making it one of the least expensive program options for weed management based on cost per month per acre of control. See why.


Use & Control

Weeds Controlled
Eclipta, bittercress, groundsel, oxalis, marestail, spurge, crabgrass and annual bluegrass

Product News

Take advantage of special savings on Marengo during the Marengo Fall Program, which runs September 1 - October 31, 2021.

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Can I use Marengo on a wide variety of plants?

Yes, Marengo is labeled for use on over 115 ornamental plants.

Where can Marengo be applied?

Marengo can be applied to field-grown and pot-in-pot nursery ornamentals, ornamental production sites, hardscapes, greenhouse floors, conifers, Christmas trees and non-bearing fruit and nut trees in nurseries.

What is the re-entry interval (REI) when using Marengo?

The REI for Marengo is 12 hours following application.

How quickly does it work?

Marengo works best once it has been activated by 0.25" of rainfall or irrigation.

How long will the effects last?

Marengo can last for up to 8 months, depending upon environmental conditions and timing of application.

Do I need to rotate Marengo with other preemergence herbicides?

As part of best management practices and for resistance management, it is recommended to rotate Marengo with other classes of chemistry, such as Ronstar® G.

How does Marengo compare to other preemergence herbicides?

Marengo lasts longer than other nursery herbicides while controlling over 70 though weeds. Marengo offers a high degree of plant safety on a wide range of ornamentals. Marengo can also be used on greenhouse floors beneath benches.

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