Herbicide label

Prowl H2O

Prowl H2O (EPA 241-418) is a Group 3 pendimethalin herbicide labeled for 25 crops. The label lists 71 controlled weeds, plus partial-control, suppression, and partner-control categories.

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Official EPA label (PDF)

“Pendimethalin, the active ingredient in Prowl H2O, is a Group 3 (WSSA)/Group K1 (HRAC) herbicide belonging to the dinitroaniline chemistry class. Prowl H2O is a meristematic inhibitor that interferes with meristematic plant cell division or mitosis inhibiting germinating seedling growth.”

— Prowl H2O EPA label, Reg. No. 241-418

Prowl H2O label facts

Crops on the Prowl H2O label

Prowl H2O is labeled for these 25 crops and uses, per the EPA label.

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Weeds on the Prowl H2O label

The Prowl H2O label names 76 weeds and rates each by how the product handles it: full control, partial control, suppression, or control with a tank-mix partner. A weed can fall at more than one level, because control varies by crop, rate, and timing.

Controls

full control71
  • amaranth, palmer
  • barnyardgrass, common
  • bittercress
  • bluegrass, annual
  • brome, downy
  • brome, japanese
  • bugloss, small
  • canarygrass
  • carpetweed
  • cheat
  • chess, hairy
  • chickweed, common
  • crabgrass
  • crowfootgrass
  • cupgrass
  • cupgrass, woolly
  • dodder
  • fescue, volunteer
  • fiddleneck
  • filaree, redstem
  • fingergrass, swollen
  • foxtail, giant
  • foxtail, green
  • foxtail, yellow
  • goatgrass, jointed
  • goosegrass
  • groundsel, common
  • henbit
  • itchgrass
  • johnsongrass, seedling
  • junglerice
  • knotweed, prostrate
  • kochia
  • lady's thumb
  • lambsquarters, common
  • lambsquarters, slimleaf
  • prickly lettuce
  • lovegrass species
  • millet, wild-proso
  • mustard, black
  • mustard, wild
  • stinging nettle
  • nightshade, black
  • wild oats
  • panicum, browntop
  • panicum, fall
  • panicum, texas
  • pigweed
  • puncturevine
  • purslane
  • pusley, florida
  • redmaids
  • red rice
  • rocket, london
  • ryegrass, annual
  • ryegrass, italian
  • ryegrass, volunteer
  • sandbur, field
  • shattercane
  • shepherd's-purse
  • sida, prickly
  • signalgrass
  • smartweed, pennsylvania
  • sprangletop, Mexican
  • sprangletop, red
  • spurge, annual
  • velvetleaf
  • watergrass, early
  • watergrass, late
  • waterhemp, common
  • witchgrass

Partial control

partial1
  • nightshade, hairy

Suppression

suppression4
  • morningglory
  • ammannia, purple
  • thistle, russian
  • umbrella sedge, smallflower

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Prowl H2O rates and plant-back

The label answers both with a table, not a single number. Here is what drives each answer.

Application rate

Your rate depends on your crop and your soil texture.

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Plant-back and rotation

Your interval depends on your application rate, the rotational crop, and your state, region, and rainfall — some intervals differ in AL, AR, AZ, CA, CO, CT, DE, FL, GA, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, and WY.

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Prowl H2O FAQ

What weeds does Prowl H2O control?

The Prowl H2O label names 76 weeds, including palmer amaranth, common barnyardgrass, bittercress, annual bluegrass, downy brome, and japanese brome. Control varies by crop, rate, and timing.

What crops is Prowl H2O labeled for?

Prowl H2O is labeled for 25 crops and uses, including field corn, soybeans, wheat, cotton, and sunflower.

What is the active ingredient in Prowl H2O? Is it a generic?

Prowl H2O's active ingredient is pendimethalin (MOA Group 3). Other products list the same active ingredient; rates, formulations, and labeled crops differ — verify each on its own label.

What's the plant-back interval after Prowl H2O?

It depends on your rotational crop, application rate, and region, so the label gives a table, not one number. Build a program and FieldMarshal cites the exact interval for your rotation to the label line, so you can verify it.

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Can I tank-mix Prowl H2O?

It depends on your target weeds, crop stage, and which partners the label approves. Build a program and FieldMarshal checks the label for approved partners and cites the condition on each, so you can verify it.

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Sources

Last updated 2026-07-10.

Other registrations of Prowl H2O