Print page Herbicide




Print page

Product Overview


Marengo® preemergence herbicide provides long-lasting weed control on over 90 weeds*.


Marengo is a selective, preemergence herbicide, that works on broadleaves, grasses and annual sedges, providing long-lasting control. Marengo is labeled for use on 150 ornamental crops*.

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.

*See the product label for the full list of weeds controlled.

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

Use & Control

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

Product News

Compare any herbicides. Use real costs. Maximize your investment.

This tool allows you to customize information to fit your exact parameters, see side-by-side numbers for any herbicides you choose, and plan for the future.

My Envu Rewards

My Envu Rewards is a loyalty program for eligible Turf and Ornamental purchases.

Not a member? Sign up here.


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.

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.

Related Resources

Product Guides



Similar Products

Secondary_Lockup_Rhapsody_R_Gradient_RGB.jpg Fungicide


Rhapsody is an effective, preventative biofungicide....

See product
Lockup_Flagship_Marengo_G_Gradient_CMYK.png Herbicide

Marengo G

Marengo® G is a granular, selective, preemergence...

See product
png-Lockup_Kontos_R_Gradient_CMYK.png Insecticide


Damaging insects don't stand a chance. Kontos provides...

See product
Lockup_Flagship_Savate_Gradient_RGB.jpg Insecticide


Savate provides excellent knockdown and residual control of...

See product
Lockup_Secondary_Chipco_R_26019_FLO_Gradient_RGB.jpg Fungicide

Chipco 26019 FLO

Chipco® 26019 FLO is a foliar-applied fungicide recommended...

See product
Lockup_Secondary_Compass_R_Gradient_RGB.jpg Fungicide

Compass 50 WG

Compass® 50 WG is a broad-spectrum strobilurin fungicide...

See product
Lockup_Secondary_Broadform_R_Gradient_RGB.png Fungicide


Broadform fungicide helps maximize foliar disease control...

See product
Lockup_Secondary_CoreTect_R_Gradient_RGB.jpg Insecticide

CoreTect Tree and Shrub Tablets

CoreTect® Tree and Shrub Tablets contain the active...

See product
Lockup_Flagship_Topchoice_Gradient_RGB.jpg Insecticide


A single application offers up to one year of fire ant...

See product
Lockup_Secondary_Acclaim_R_Extra_Gradient_RGB.png Herbicide

Acclaim Extra

Effective herbicide control when you need it most. Acclaim®...

See product
Lockup_Secondary_Aliette_R_WDG_Gradient_RGB.png Fungicide

Aliette WDG

Systemic control of Phytophthora and downy mildew Aliette®...

See product
Lockup_Flagship_Altus_Gradient_RGB.png Insecticide


Altus is a novel insecticide that can be used on a wide...

See product