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Home > Weeds

Weeds

A weed is a plant out of place, not intentionally sown, whose undesirable qualities outweigh its good points. Even crop plants can become weeds when they grow where they are not wanted. In contrast, a number of plants usually thought of as weeds may actually be helpful—in controlling erosion, serving as food for wild animals, birds or humans, or can be considered beautiful in their own right.

Canada thistle flower

Canada Thistle

vetch

Vetch

morning glory

Morning Glory (Bindweed)

     

purple loosestrife

Purple Loosestrife

creeping charlie

Creeping Charlie

chickweed

Chickweed

     

garlic mustard

Garlic Mustard

hairy galinsoga

Hairy Galinsoga

woodsorrel

Woodsorrel

     

purslane

Common Purslane

sowthistle

Sowthistle

dandelion

Dandelion

     

cypress spurge

Cypress Spurge

yellow nutsedge

Yellow Nutsedge

quackgrass

Quackgrass

     

crabgrass

Crabgrass

ragweed

Ragweed

Shepherd's Purse

Shepherd's Purse

     

lambsquarters

Lambsquarters

pigweed

Pigweed

common plantain

Plantain

     

Oriental bittersweet

Oriental Bittersweet

poison ivy

Poison Ivy

giant hogweed

Giant Hogweed

     

Japanese knotweed

Japanese Knotweed

field horsetail

Field Horsetail

     

 

Didn't find what you were looking for? More Help with Weed Identification
Want to Know More? Links to More Information About Healthy Gardens and Lawns, Composting and Mulching, Beneficial Organisms, IPM and More

 

 

[Photos, left to right: (Canada thistle) John M. Randall, The Nature Conservancy, Bugwood.org; (vetch) Dan Tenaglia, Missouriplants.com; (morning glory) K. George Beck & James Sebastian, Colorado State University, Bugwood.org; (purple loosestrife) John D. Byrd, Mississippi State University, Bugwood.org; (creeping charlie) Leslie J. Mehrhoff, University of Connecticut, Bugwood.org; (chickweed) Joseph M. DiTomaso, University of California - Davis, Bugwood.org; (garlic mustard) David Cappaert, Michigan State University, Bugwood.org; (hairy galinsoga) Joseph M. DiTomaso, University of California - Davis, Bugwood.org; (woodsorrel) Joseph M. DiTomaso, University of California - Davis, Bugwood.org; (purslane) Joseph M. DiTomaso, University of California - Davis, Bugwood.org; (sowthistle) Chris Evans, River to River CWMA, Bugwood.org; (dandelion) Dave Powell, USDA Forest Service, Bugwood.org; (cypress spurge) Todd Pfeiffer, Klamath County Weed Control, Bugwood.org; (yellow nutsedge) Jeff Stachler, The Ohio State University, Bugwood.org; (quackgrass) Steve Dewey, Utah State University, Bugwood.org; (crabgrass) Richard Old, XID Services, Inc., Bugwood.org; (ragweed) Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org; (shepherd's purse) Robert Vidéki, Doronicum Kft., Bugwood.org; (lambsquarters) Joseph M. DiTomaso, University of California - Davis, Bugwood.org; (pigweed) Steve Dewey, Utah State University, Bugwood.org; (plantain) Lynn Sosnoskie, University of Georgia, Bugwood.org; (Oriental bittersweet) Nancy Loewenstein, Auburn University, Bugwood.org; (poison ivy) Catherine Herms, The Ohio State University, Bugwood.org; (giant hogweed) Maine Department of Agriculture; (Japanese knotweed) Richard Old, XID Services, Inc., Bugwood.org; (field horsetail) Gil Wojciech, Polish Forest Research Institute, Bugwood.org; John Cardina, The Ohio State University, Bugwood.org]

 
It is the policy of the State of Maine to minimize reliance on pesticides. The Maine Department of Agriculture and the Maine IPM Council encourage everyone to practice integrated pest management and to use pesticides only as a last resort. The mention of pesticides in the fact sheets linked to these pages does not imply an endorsement of any product. Be sure that any product used is currently registered and follow all label directions.