Weed Identification

Weed identification (ID) on a farm can sometimes be a tedious task. But weeds must be identified prior to weed control activities. Two weed species may look very similar at a given growth stage but may differ greatly in terms of the life cycle, modes of reproduction, crop-weed competition, and responses to control tactics.

This part of the website can help you identify weeds that may be a problem in your area. We have separated weed ID resources into the following three categories.


Use web-based tools or smartphone apps to identify weeds. Use these tools if you know what the weed looks like or where it grows but not its name.

Web-based apps:

Smartphone apps (iOS or Android)

Photo Galleries (by region):

Use weed ID galleries if you know what the weed looks like or its name or when researching specific weeds of your region to learn common potential problem weeds. Find photos and identifying characteristics that will help you identify common weeds and learn more about them.





Guides (hard copy):

If you like to have a hard copy or book handy for your reference to ID weeds while in the field.

IPM Pocket Guide for Weed ID in Field Crops

Weed ID and Herbicide Injury Guide

Weed ID Field Guide

Other resources

Weeds of the Northeast

  • Weeds of the Northeast
    Richard H. Uva, Joseph C. Neal, and Joseph M. DiTomaso
    ISBN: 978-0801483349


Weeds of the South

  • Weeds of the South
    edited by Charles T. Bryson and Michael S. DeFelice
    ISBN: 978-0820330464


Weeds of the Midwestern United States and Central Canada

  • Weeds of the Midwestern United States and Central Canada
    edited by Charles T. Bryson & Michael S. DeFelice
    SBN: 978-0820335063


Weeds of the West

  • Weeds of the West
    by Tom D. Whitson, Larry C. Burrill, Steven A. Dewey, David W. Cudney, and B.E. Nelson
    ISBN: 978-0756711825