Marengo® G


Marengo® is a pre-emergent granular herbicide that offers long-term residual control of both grassy and broadleaf weeds on ornamentals grown in production nurseries including those grown in-ground and in containers. Marengo G may also be used on conifers and Christmas trees. Marengo can be used in ornamental production sites and hardscapes and is labeled for use in shade houses and hoop houses in areas covered by landscape fabric, rock or under benches.


With the new active ingredient indaziflam, Marengo G offers long term control of many hard-to-control broadleaf weeds such as bittercress, groundsel, oxalis, marestail, and spurge. Marengo G also controls tough grassy weeds such as crabgrass, annual bluegrass, and annual sedge. Marengo G also demonstrates early post-emergence activity against some weeds, including annual bluegrass, crabgrass, and oxalis.


A granular formulation, Marengo G contains the first active ingredient from MOA (Mode of Action) Group 29. The active ingredient prevents weed seed germination by inhibiting cellulose biosynthesis. Marengo G does not move once applied to the soil and does not volatilize.


Production Ornamentals

Marengo G use rates range from 100 to 200 pounds per acre. Research recommends 200 pounds per acre.

Marengo G should be applied to dry foliar or areas. Do not allow the granules to remain on leaves for extended periods For best results, users should activate Marengo G with a minimum of ¼ inch of water within 2 days of application.


Non-Selective Uses

Marengo G may be used to maintain bare ground in non-crop areas, including gravel areas as well as rocky/sandy areas. Apply 200 to 400 pounds per acre with uniform coverage to target areas.


Ornamental Production facilities

Marengo G may be used in production facilities such as areas covered by landscape fabric, hoop-houses, lathhouses and shadehouses to provide bare ground and general weed control beneath benches and potted plants. Make applications to these sites during clean up, sanitation and preparation prior to plant production. Apply 200 pounds per acre or 4.6 pounds per 1000 square feet target area.


Current state registrations

Marengo G Herbicide
  • EPA Registration Number432-1523-59807
  • Restricted Entry Interval (REI)12 hours
  • Chemical FamilyAlkylazines
  • MOA29
  • Active IngredientIndaziflam
  • Rate per acre (see label)100 - 400 lbs./acre
  • Maximum rate400 lbs. per acre/per year
  • ApplicationGranular over the top of ornamentals; broadcast granular application over target ground area

Labeled for use on:

Production ornamentals, shadehouses, hoop houses and hardscapes


Labeled plants:

Marengo has shown excellent plant tolerance on a wide variety of ornamentals. Please consult the label for a full list. If a cultivar is not listed on the label, users should treat several plants at the single maximum desired use rate and evaluate 1 to 2 months later for possible injury and acceptable tolerance.



50 pound bag / 40 bags per pallet



Research recommends 200 pounds per acre for best weed control Irrigation or rainfall is necessary to activate Marengo G Do not apply more than 400 pounds per acre per year