Getting Rid Of Weeds
Through Integrated Weed Management

We are a publicly led network coordinating research and outreach, providing science-based information and decision support tools to make agriculture more sustainable and precise. We work to develop integrated weed management solutions that are practical and adoptable.

Recent IWM News

How to Make Cover Crops Work in Montana

  January 2, 2024   Grow IWM
Water is a precious commodity in Montana cropping and livestock systems, where annual rainfall amounts can range from 6 to 22...
  Industry News      News From Other Sources      Cover Crops      Grow News   

New Resource Alert: The Weed Management Planner

  December 19, 2023   Grow IWM
Creating a better weed control strategy just got a little easier! GROW’s newest resource, the Weed Management Planner, is...
  Herbicide Resistant Weeds      Prevention      Mechanical Weed Control      Cover Crops      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Harvest Weed Seed Management   

Farmer Forum Recap: Using Seed Impact Mills for Weed Control

  December 12, 2023   Grow IWM
In GROW’s last Farmer Forum of 2023, a panel of farmers from Texas and Washington shared their experiences using seed impact...
  Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control      Harvest Weed Seed Management      Grow News      Harvest Weed Seed Control   

New Penn State Guide Tackles Weed Control in Organic No-Till Soybean Systems

  December 5, 2023   Grow IWM
Imagine a weed management system with no access to herbicides and no conventional tillage implements. Intimidated? Welcome to the...
  Weed Electrocution      Industry News      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control      Cover Crops   

Making Chaff Lining Work on Shepherd Grain Farms

  November 28, 2023   Grow IWM
John Shepherd is no stranger to integrated weed management. The Virginia farmer already uses cover crops and herbicides to battle...
  Mechanical Weed Control      Harvest Weed Seed Management      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

Eastern Shore Farmer Tries Chaff Lining to Defeat Weeds

  November 21, 2023   Grow IWM
Third time is usually the charm, but it only took two tries for farmer Jarrett Sturgis to declare chaff lining a likely success...
  Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Harvest Weed Seed Management      Grow News   

Join a GROW Farmer Forum on Using Seed Impact Mills for Weed Control

  November 17, 2023   Grow IWM
GROW will be hosting a Farmer Forum on December 4th, 2023, at 1 p.m. ET. Listen in as three U.S. farmers explain why they decided...
  Prevention      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Harvest Weed Seed Management   

Narrow Soybean Rows: How to Manage Both Weeds & White Mold

  November 14, 2023   Grow IWM
When it comes to choosing soybean row spacing, some farmers feel torn between opting for narrow rows and better weed control or...
  News From Other Sources      Prevention      Precision Weed Management      Industry News      Herbicide Resistant Weeds   

Cheatgrass (Downy Brome) Management in the Western U.S. 

  November 7, 2023   Grow IWM
Downy brome is a weed so famous for stealing wheat yields that the pioneers dubbed it “cheatgrass,” when they first...
  News From Other Sources      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

Hiring Announcement: Precision Sustainable Agriculture

  November 6, 2023   Grow IWM
GROW’s partner organization, Precision Sustainable Agriculture (PSA), is hiring! PSA is a network of scientists and digital...
  Grow News      Industry News      DIGITAL AGRICULTURE      Precision Weed Management   

The Latest on Herbicide Resistance & Weed Management in Montana

  October 31, 2023   Grow IWM
GROW recently caught up with Montana State University weed scientists, Dr. Tim Seipel and Dr. Lovreet Shergill, for a deep dive...
  Industry News      Integrated Weed Management Innovations      Mechanical Weed Control      Cover Crops      Herbicide Resistant Weeds      Harvest Weed Seed Management   

Scout for Palmer Amaranth and Waterhemp to Prevent Spreading Seeds with the Combine

  October 24, 2023   Grow IWM
The following is reprinted from Penn State Extension. Due to dry conditions early in the production season, we are seeing more...
  Harvest Weed Seed Management      Industry News      Prevention      Harvest Weed Seed Control      Herbicide Resistant Weeds      Mechanical Weed Control   

How to Make Cover Crops Work in Montana

  January 2, 2024   Grow IWM
Water is a precious commodity in Montana cropping and livestock systems, where annual rainfall amounts can range from 6 to 22...
  Industry News      News From Other Sources      Cover Crops      Grow News   

New Resource Alert: The Weed Management Planner

  December 19, 2023   Grow IWM
Creating a better weed control strategy just got a little easier! GROW’s newest resource, the Weed Management Planner, is...
  Herbicide Resistant Weeds      Prevention      Mechanical Weed Control      Cover Crops      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Harvest Weed Seed Management   

New Penn State Guide Tackles Weed Control in Organic No-Till Soybean Systems

  December 5, 2023   Grow IWM
Imagine a weed management system with no access to herbicides and no conventional tillage implements. Intimidated? Welcome to the...
  Weed Electrocution      Industry News      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control      Cover Crops   

The Latest on Herbicide Resistance & Weed Management in Montana

  October 31, 2023   Grow IWM
GROW recently caught up with Montana State University weed scientists, Dr. Tim Seipel and Dr. Lovreet Shergill, for a deep dive...
  Industry News      Integrated Weed Management Innovations      Mechanical Weed Control      Cover Crops      Herbicide Resistant Weeds      Harvest Weed Seed Management   

Interseeding Cover Crops in Corn: A Research Deep Dive

  October 17, 2023   Grow IWM
Interseeding cover crops into standing corn can help growers avoid the hustle and delays of harvest season and give their covers...
  Cover Crops      Industry News      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

EPA Tours Maryland Crops & Weeds Research  

  October 9, 2023   Grow IWM
In its continuing quest to keep regulators connected with current farming practices, the Weed Science Society of America (WSSA),...
  Mechanical Weed Control      News From Other Sources      Cover Crops      Grow News      featured      Herbicide Resistant Weeds   

Weed Control Remains a Primary Goal for Cover Crop Users

  September 21, 2023   Grow IWM
The numbers are in, and weed control remains one of farmers’ primary – and most successful – goals for adding cover crops...
  Industry News      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Cover Crops   

The Hunt to Learn How Much Herbicide is Intercepted by a Cover Crop

  August 29, 2023   Grow IWM
A thick stand of cover crops can help suppress weeds, but it can also intercept residual herbicides sprayed in the spring to...
  Grow News      Integrated Weed Management Innovations      Cover Crops   

Should You Adjust Cover Crop Seeding Rates as Planting Dates Change?

  August 22, 2023   Grow IWM
Cover crop seeding is often the last box to check in the fall for farmers, and planting windows don’t always cooperate. ...
  Prevention      Industry News      Integrated Weed Management Innovations      Cover Crops   

Planting Fall Covers? Know Your Herbicide Carryover Risks.

  August 15, 2023   Grow IWM
It’s fall cover crop seeding time, and with large swaths of the Midwest facing droughty soils, herbicide carryover injury could...
  Grow News      Cover Crops      featured   

Farmer Forum Recap: Cover Crop Seeding

  July 25, 2023   Grow IWM
In GROW’s latest Farmer Forum, a panel of farmers from Delaware, New York and Texas shared their experiences with all aspects...
  Cover Crops      Prevention      Grow News      Integrated Weed Management Innovations   

The Cover Crop That Never Dies: Scientists Explore Living Mulch

  July 18, 2023   Grow IWM
Imagine a cover crop that never stops growing — nestled between the rows of a cash crop, continuously suppressing weeds and...
  Industry News      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Cover Crops      Prevention   

How to Make Cover Crops Work in Montana

  January 2, 2024   Grow IWM
Water is a precious commodity in Montana cropping and livestock systems, where annual rainfall amounts can range from 6 to 22...
  Industry News      News From Other Sources      Cover Crops      Grow News   

New Resource Alert: The Weed Management Planner

  December 19, 2023   Grow IWM
Creating a better weed control strategy just got a little easier! GROW’s newest resource, the Weed Management Planner, is...
  Herbicide Resistant Weeds      Prevention      Mechanical Weed Control      Cover Crops      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Harvest Weed Seed Management   

Farmer Forum Recap: Using Seed Impact Mills for Weed Control

  December 12, 2023   Grow IWM
In GROW’s last Farmer Forum of 2023, a panel of farmers from Texas and Washington shared their experiences using seed impact...
  Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control      Harvest Weed Seed Management      Grow News      Harvest Weed Seed Control   

Making Chaff Lining Work on Shepherd Grain Farms

  November 28, 2023   Grow IWM
John Shepherd is no stranger to integrated weed management. The Virginia farmer already uses cover crops and herbicides to battle...
  Mechanical Weed Control      Harvest Weed Seed Management      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

Eastern Shore Farmer Tries Chaff Lining to Defeat Weeds

  November 21, 2023   Grow IWM
Third time is usually the charm, but it only took two tries for farmer Jarrett Sturgis to declare chaff lining a likely success...
  Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Harvest Weed Seed Management      Grow News   

Join a GROW Farmer Forum on Using Seed Impact Mills for Weed Control

  November 17, 2023   Grow IWM
GROW will be hosting a Farmer Forum on December 4th, 2023, at 1 p.m. ET. Listen in as three U.S. farmers explain why they decided...
  Prevention      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Harvest Weed Seed Management   

Cheatgrass (Downy Brome) Management in the Western U.S. 

  November 7, 2023   Grow IWM
Downy brome is a weed so famous for stealing wheat yields that the pioneers dubbed it “cheatgrass,” when they first...
  News From Other Sources      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

Hiring Announcement: Precision Sustainable Agriculture

  November 6, 2023   Grow IWM
GROW’s partner organization, Precision Sustainable Agriculture (PSA), is hiring! PSA is a network of scientists and digital...
  Grow News      Industry News      DIGITAL AGRICULTURE      Precision Weed Management   

EPA Tours Maryland Crops & Weeds Research  

  October 9, 2023   Grow IWM
In its continuing quest to keep regulators connected with current farming practices, the Weed Science Society of America (WSSA),...
  Mechanical Weed Control      News From Other Sources      Cover Crops      Grow News      featured      Herbicide Resistant Weeds   

HWSC in the Pacific Northwest: Greene Ridge Farms Tackles Tough Weeds with Seed Impact Mill

  October 3, 2023   Grow IWM
Mark Greene’s fields only see 10 to 12 inches of rain on his farm in Asotin County, a flat, semiarid section of the Palouse...
  Mechanical Weed Control      Prevention      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

A Weed Seed Killing Machine: Testing the Redekop Seed Control Unit 

  September 28, 2023   Grow IWM
Killing weed seeds is dirty work, but with herbicide-resistant weeds on the rise, someone has to do it! That’s why Virginia...
  Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control      Prevention      Grow News   

HWSC in the Pacific Northwest: Simon Crawford’s First Year with a Seed Impact Mill

  September 26, 2023   Grow IWM
There’s a new tool at work in the fields of JIG Farms – a seed impact mill.  Owned and operated by Simon Crawford, JIG...
  featured      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control   

New Resource Alert: The Weed Management Planner

  December 19, 2023   Grow IWM
Creating a better weed control strategy just got a little easier! GROW’s newest resource, the Weed Management Planner, is...
  Herbicide Resistant Weeds      Prevention      Mechanical Weed Control      Cover Crops      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Harvest Weed Seed Management   

Farmer Forum Recap: Using Seed Impact Mills for Weed Control

  December 12, 2023   Grow IWM
In GROW’s last Farmer Forum of 2023, a panel of farmers from Texas and Washington shared their experiences using seed impact...
  Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control      Harvest Weed Seed Management      Grow News      Harvest Weed Seed Control   

New Penn State Guide Tackles Weed Control in Organic No-Till Soybean Systems

  December 5, 2023   Grow IWM
Imagine a weed management system with no access to herbicides and no conventional tillage implements. Intimidated? Welcome to the...
  Weed Electrocution      Industry News      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control      Cover Crops   

Making Chaff Lining Work on Shepherd Grain Farms

  November 28, 2023   Grow IWM
John Shepherd is no stranger to integrated weed management. The Virginia farmer already uses cover crops and herbicides to battle...
  Mechanical Weed Control      Harvest Weed Seed Management      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

Eastern Shore Farmer Tries Chaff Lining to Defeat Weeds

  November 21, 2023   Grow IWM
Third time is usually the charm, but it only took two tries for farmer Jarrett Sturgis to declare chaff lining a likely success...
  Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Harvest Weed Seed Management      Grow News   

Join a GROW Farmer Forum on Using Seed Impact Mills for Weed Control

  November 17, 2023   Grow IWM
GROW will be hosting a Farmer Forum on December 4th, 2023, at 1 p.m. ET. Listen in as three U.S. farmers explain why they decided...
  Prevention      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Harvest Weed Seed Management   

Narrow Soybean Rows: How to Manage Both Weeds & White Mold

  November 14, 2023   Grow IWM
When it comes to choosing soybean row spacing, some farmers feel torn between opting for narrow rows and better weed control or...
  News From Other Sources      Prevention      Precision Weed Management      Industry News      Herbicide Resistant Weeds   

Cheatgrass (Downy Brome) Management in the Western U.S. 

  November 7, 2023   Grow IWM
Downy brome is a weed so famous for stealing wheat yields that the pioneers dubbed it “cheatgrass,” when they first...
  News From Other Sources      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

The Latest on Herbicide Resistance & Weed Management in Montana

  October 31, 2023   Grow IWM
GROW recently caught up with Montana State University weed scientists, Dr. Tim Seipel and Dr. Lovreet Shergill, for a deep dive...
  Industry News      Integrated Weed Management Innovations      Mechanical Weed Control      Cover Crops      Herbicide Resistant Weeds      Harvest Weed Seed Management   

Scout for Palmer Amaranth and Waterhemp to Prevent Spreading Seeds with the Combine

  October 24, 2023   Grow IWM
The following is reprinted from Penn State Extension. Due to dry conditions early in the production season, we are seeing more...
  Harvest Weed Seed Management      Industry News      Prevention      Harvest Weed Seed Control      Herbicide Resistant Weeds      Mechanical Weed Control   

Interseeding Cover Crops in Corn: A Research Deep Dive

  October 17, 2023   Grow IWM
Interseeding cover crops into standing corn can help growers avoid the hustle and delays of harvest season and give their covers...
  Cover Crops      Industry News      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

EPA Tours Maryland Crops & Weeds Research  

  October 9, 2023   Grow IWM
In its continuing quest to keep regulators connected with current farming practices, the Weed Science Society of America (WSSA),...
  Mechanical Weed Control      News From Other Sources      Cover Crops      Grow News      featured      Herbicide Resistant Weeds   

New Resource Alert: The Weed Management Planner

  December 19, 2023   Grow IWM
Creating a better weed control strategy just got a little easier! GROW’s newest resource, the Weed Management Planner, is...
  Herbicide Resistant Weeds      Prevention      Mechanical Weed Control      Cover Crops      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Harvest Weed Seed Management   

Farmer Forum Recap: Using Seed Impact Mills for Weed Control

  December 12, 2023   Grow IWM
In GROW’s last Farmer Forum of 2023, a panel of farmers from Texas and Washington shared their experiences using seed impact...
  Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control      Harvest Weed Seed Management      Grow News      Harvest Weed Seed Control   

Making Chaff Lining Work on Shepherd Grain Farms

  November 28, 2023   Grow IWM
John Shepherd is no stranger to integrated weed management. The Virginia farmer already uses cover crops and herbicides to battle...
  Mechanical Weed Control      Harvest Weed Seed Management      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

Eastern Shore Farmer Tries Chaff Lining to Defeat Weeds

  November 21, 2023   Grow IWM
Third time is usually the charm, but it only took two tries for farmer Jarrett Sturgis to declare chaff lining a likely success...
  Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Harvest Weed Seed Management      Grow News   

Join a GROW Farmer Forum on Using Seed Impact Mills for Weed Control

  November 17, 2023   Grow IWM
GROW will be hosting a Farmer Forum on December 4th, 2023, at 1 p.m. ET. Listen in as three U.S. farmers explain why they decided...
  Prevention      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Harvest Weed Seed Management   

Cheatgrass (Downy Brome) Management in the Western U.S. 

  November 7, 2023   Grow IWM
Downy brome is a weed so famous for stealing wheat yields that the pioneers dubbed it “cheatgrass,” when they first...
  News From Other Sources      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

Scout for Palmer Amaranth and Waterhemp to Prevent Spreading Seeds with the Combine

  October 24, 2023   Grow IWM
The following is reprinted from Penn State Extension. Due to dry conditions early in the production season, we are seeing more...
  Harvest Weed Seed Management      Industry News      Prevention      Harvest Weed Seed Control      Herbicide Resistant Weeds      Mechanical Weed Control   

HWSC in the Pacific Northwest: Greene Ridge Farms Tackles Tough Weeds with Seed Impact Mill

  October 3, 2023   Grow IWM
Mark Greene’s fields only see 10 to 12 inches of rain on his farm in Asotin County, a flat, semiarid section of the Palouse...
  Mechanical Weed Control      Prevention      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

A Weed Seed Killing Machine: Testing the Redekop Seed Control Unit 

  September 28, 2023   Grow IWM
Killing weed seeds is dirty work, but with herbicide-resistant weeds on the rise, someone has to do it! That’s why Virginia...
  Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control      Prevention      Grow News   

HWSC in the Pacific Northwest: Simon Crawford’s First Year with a Seed Impact Mill

  September 26, 2023   Grow IWM
There’s a new tool at work in the fields of JIG Farms – a seed impact mill.  Owned and operated by Simon Crawford, JIG...
  featured      Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control   

HWSC in the Pacific Northwest: Druffel Farms Adds a Seed Impact Mill to Manage Weeds

  September 19, 2023   Grow IWM
Dale and Nick Druffel farm almost 2,800 acres near Uniontown, WA, in the beautiful rolling hills of the Palouse Region. As...
  Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Mechanical Weed Control      Prevention   

HWSC in the Pacific Northwest: Farmers Lead the Way in this Series 

  September 12, 2023   Grow IWM
The Palouse region is the heartland of the inland Pacific Northwest (PNW), covering the stunningly beautiful landscapes of...
  Grow News      Industry News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Harvest Weed Seed Management   

No Seeds. No Weeds.

For over 50 years, herbicides have been a highly effective method to control weeds and protect crop yields. Herbicides have supported the wide-spread use of no-till and limited cultivation for weed control, improving soil health. However, over reliance on a few key herbicides has caused the development of particularly problematic herbicide-resistant weeds.

For some farmers, herbicides alone just aren’t getting the job done anymore.

Integrated Weed Management (IWM) is the answer.

Prevention Cultural Chemical Biological Mechanical IWM

What is Integrated Weed Management?

Integrated weed management (IWM) combines various methods to reduce or eliminate the effect of weeds on crop production over time, using a combination of practices that are most effective for solving specific weed issues. Techniques include:

In the Fields

What Are Your Problem Weeds?

Wild Oats
Russian Thistle
Rush Skeletonweed
Rettail Fescue
Prickly Lettuce
Mustard Species in Wheat
Mayweed Chamomille
Jointed Goatgrass
Field Bindweed
Feral Rye
Downy Brome
Common Barberry